CN108668361B

CN108668361B - Information generation method and equipment

Info

Publication number: CN108668361B
Application number: CN201710214206.8A
Authority: CN
Inventors: 熊琦; 喻斌; 钱辰
Original assignee: Samsung Electronics Co Ltd
Current assignee: Samsung Electronics Co Ltd
Priority date: 2017-04-01
Filing date: 2017-04-01
Publication date: 2023-08-04
Anticipated expiration: 2037-04-01
Also published as: CN108668361A

Abstract

The application discloses an information generation method, which comprises the following steps: pre-corresponding to a random access resource, grouping a plurality of available random access lead codes to obtain a lead code group; and calculating the RA-RNTI according to the group index of the preamble group where the random access preamble sent by the UE is located and the resource position of the random access resource carrying the random access preamble. By the method and the device, the users with different downlink transmission beams can be distinguished and selected, and the detection efficiency of random access response is improved.

Description

Information generation method and equipment

Technical Field

The present disclosure relates to the field of wireless communications technologies, and in particular, to an information generating method and apparatus.

Background

With the rapid development of the information industry, especially the growing demand from the mobile internet and internet of things (IoT, internet of things), the future mobile communication technology is challenged unprecedented. As per the international telecommunications union ITU report ITU-R M [ imt. Beyond 2020.Traffic ], it is expected that in 2020, mobile traffic will increase approximately 1000 times as compared to 2010 (4G age), the number of user equipment connections will also exceed 170 billions, and the number of connected devices will be even more dramatic as the vast number of IoT devices gradually penetrate into the mobile communication network. To address this unprecedented challenge, the communications industry and academia have developed a wide range of fifth generation mobile communication technology research (5G), oriented in the 2020 s. The framework and overall goals of future 5G have been discussed in ITU report ITU-R M [ imt.vision ], where the requirements expectations, application scenarios and important performance metrics of 5G are specified. For new demands in 5G, ITU report ITU-R M [ imt.future TECHNOLOGY TRENDS ] provides information about technical trends for 5G, aiming at solving significant problems of significant improvement of system throughput, user experience consistency, scalability to support IoT, latency, energy efficiency, cost, network flexibility, support of emerging services, flexible spectrum utilization, etc.

The performance of random access directly affects the user experience. In conventional wireless communication systems, such as LTE and LTE-Advanced, a random access procedure is applied to various scenarios, such as initial link establishment, cell handover, uplink re-establishment, RRC connection reestablishment, etc., and is classified into Contention-based random access (content-based Random Access) and non-Contention-based random access (content-free Random Access) according to whether a user monopolizes a preamble sequence resource. In the random access based on competition, each user selects a preamble sequence from the same preamble sequence resource in the process of attempting to establish uplink, and a plurality of users may select the same preamble sequence to send to a base station, so that a conflict resolution mechanism is an important research direction in the random access, and how to reduce the conflict probability and how to quickly resolve the conflict which has occurred is a key index affecting the random access performance.

The contention-based random access procedure in LTE-a is divided into four steps as shown in fig. 1. In the first step, the user randomly selects a random access preamble sequence (i.e. random access preamble code) from the preamble sequence resource pool, and sends the random access preamble sequence (i.e. random access preamble code) to the base station. The base station carries out correlation detection on the received signals so as to identify a preamble sequence sent by a user; in the second step, the base station transmits a random access response (Random Access Response, RAR) to the user, including a random access preamble identifier, a timing advance instruction determined according to the time delay estimation between the user and the base station, a Temporary Cell-Radio Network Temporary Identifier (TC-RNTI), and a time-frequency resource allocated for the next uplink transmission of the user; in a third step, the user receives the RAR and sends a third message (Msg 3) to the base station according to the information in the RAR. The Msg3 contains information such as a user terminal identifier, an RRC (radio resource control) link request and the like, wherein the user terminal identifier is unique to a user and is used for resolving conflicts; in the fourth step, the base station sends conflict resolution identification to the user, including the user terminal identification of the user winning in the conflict resolution. After detecting the self-contained identification, the user upgrades the temporary C-RNTI into the C-RNTI, sends an ACK signal to the base station, completes the random access process, and waits for the scheduling of the base station. Otherwise, the user will start a new random access procedure after a delay.

For non-contention based random access procedures, the user may be assigned a preamble sequence since the base station knows the user identity. Thus, the user does not need to randomly select a sequence when transmitting the preamble sequence, but can use the allocated preamble sequence. After detecting the allocated preamble sequence, the base station sends corresponding random access response including information such as timing advance and uplink resource allocation. After receiving the random access response, the user considers that the uplink synchronization is completed and waits for further scheduling of the base station. Thus, the non-contention based random access procedure only comprises two steps: step one, transmitting a preamble sequence; and step two, sending a random access response.

The random access procedure in LTE is applicable to the following scenarios:

initial access under rrc_idle;

2. reestablishing the RRC connection;

3. cell switching;

the RRC connection state downlink data arrives and requests a random access procedure (when the uplink is asynchronous);

the RRC connection state downlink and uplink data arrives and requests a random access process (when the uplink is asynchronous or the resource is not allocated to the scheduling request in the PUCCH resource);

6. and (5) positioning.

In LTE, the six scenarios described above use the same random access procedure. In some scenarios, for example, when no scheduling request resource is allocated in the PUCCH resource, the contention-based random access procedure actually works in the RRC connected state, so that the original random access procedure may be optimized to be more suitable for the scheduling request scenario in the connected state. In addition, in NR, there are other applications that require contention-based random access in RRC connected state, such as beam request or beam recovery when carrier frequency is greater than 6 GHz. In NR standardization, it is therefore necessary to provide an optimized uplink scheduling request manner for users in a connected state.

In a conventional LTE network, when the network transmits information of the second step of Random Access, that is, a Random Access response, random Access radio network temporary identifier (RA-RNTI) is required to scramble the RAR information, and meanwhile, the user side also needs to generate the RA-RNTI in the same manner to descramble a possible RAR so as to detect the Random Access response. Currently, when generating RA-RNTI, it is calculated according to the location of the random access time-frequency resource carrying the random access preamble, so that only users transmitting the preamble on the same random access time-frequency resource can generate the same RA-RNTI.

Disclosure of Invention

The information generation method can distinguish users selecting different downlink transmission beams and improve the detection efficiency of random access response.

In order to achieve the above purpose, the present application adopts the following technical scheme:

an information generation method, comprising:

the User Equipment (UE) sends a random access preamble to a base station;

the UE calculates RA-RNTI according to the packet index of the preamble packet where the sent random access preamble is located and the resource position of the random access resource bearing the random access preamble;

Wherein the preamble group is a group of available random access preambles corresponding to a random access resource.

Preferably, the random access resource is determined according to a downlink transmission beam selected by the UE based on downlink measurement;

the transmitted random access preamble is selected from a preamble packet corresponding to the random access resource and bonded with a downlink transmission beam selected by the UE based on a downlink measurement.

Preferably, the random access resource is determined according to a physical broadcast signal or a synchronization signal block selected by the UE based on downlink measurement;

the transmitted random access preamble is selected from a preamble packet corresponding to the random access resource and bonded with a physical broadcast signal or a synchronization signal block selected by the UE based on a downlink measurement.

Preferably, when different preamble packets are bound one-to-one with different downlink transmission beams, the preamble packet index is the beam index of the selected downlink transmission beam.

Preferably, the preamble group is determined according to a preamble root sequence group to which a preamble root sequence used by an available random access preamble belongs, wherein random access preambles determined by using the same group of preamble root sequences belong to the same preamble group;

The packet index of the preamble packet is: the root sequence packet index of the packet in which the preamble root sequence of the random access preamble is located.

Preferably, the preamble group is determined according to an orthogonal cover code word group to which an orthogonal cover code word used by an available random access preamble belongs, wherein the random access preambles determined by using the same group of orthogonal cover code words belong to the same preamble group;

the packet index of the preamble packet is: an orthogonal cover code word grouping index of a group in which an orthogonal cover code word of the random access preamble is located is generated.

Preferably, the preamble group is determined according to a cyclic shift group to which a cyclic shift value used by an available random access preamble belongs, wherein random access preambles determined by using the same cyclic shift value belong to the same preamble group;

the packet index of the preamble packet is: and generating a cyclic shift packet index of the packet where the corresponding cyclic shift value is located when the random access preamble is generated.

Preferably, the preamble packet is determined according to random access preambles, wherein each random access preamble is a preamble packet;

The group index of the preamble group is a random access preamble index.

Preferably, the method for calculating the RA-RNTI according to the packet index of the preamble packet and the resource location of the random access resource carrying the random access preamble comprises:

calculating an RA-RNTI according to index information t_id of a time unit where a starting position of the random access resource is located, index information f_id of a frequency unit where the starting position of the random access resource is located and packet index pg_id of the preamble packet, wherein RA-RNTI=1+a+b+f_id+c_pg_id; wherein a, b and c are preset weighting coefficients corresponding to t_id, f_id and pg_id respectively.

Preferably, when there is no time domain distinction between different random access resources, t_id is set to 0 when calculating the RA-RNTI;

and/or the number of the groups of groups,

when there is no distinction in the frequency domain between different random access resources, f_id is set to 0 when calculating the RA-RNTI.

Calculating an RA-RNTI according to an index sfn_id of a first time unit in which the random access resource is located, an index information t_id of a first second time unit in which the random access resource is located, an index information f_id of a first frequency domain unit in which the random access resource is located, and a packet index pg_id of the preamble packet, wherein RA-rnti=1+a×t_id+b×f_id+c (sfn_id mod (Wmax/10))+d×pg_id; wherein a, b, c and d are respectively preset weighting coefficients corresponding to t_id, f_id, (SFN_id mod (Wmax/10)) and pg_id, wmax is the maximum window length of a possible random access response window of a user.

Preferably, a=1, b=max {1+a×t_id } =m+1, c=max {1+a×t_id+b×f_id } = (max { t_id } +1) (max { f_id } +1).

Preferably, the index information t_id of the time unit/second time unit is: the index value of the time unit/the second time unit, or the t_id is determined according to the index values in a plurality of time units where the random access resource is located;

and/or the number of the groups of groups,

the index information f_id of the frequency unit is: and the index value of the frequency domain unit, or the f_id is determined according to the index values of the random access resource in a plurality of frequency units.

Preferably, the index value of the time unit/second time unit is: subframe index, slot index, minislot index, symbol group index, or symbol index; and/or the number of the groups of groups,

the index values within the plurality of time units include: a plurality of indexes of subframe indexes, slot indexes, minislot indexes, symbol group indexes and symbol indexes; and/or the number of the groups of groups,

the first time unit is a wireless frame; and/or the number of the groups of groups,

the index of the frequency unit is: a physical resource block, PRB, group index, PRB index, subcarrier index, or subcarrier group index; and/or the number of the groups of groups,

the index values within the plurality of frequency bins include: a PRB group index, a PRB index, a subcarrier index, and a plurality of indexes of the subcarrier group index.

calculating RA-RNTI according to the index SFN_id of the first time unit where the random access resource is located and the packet index pg_id of the preamble packet, wherein RA-RNTI=1+a floor (SFN_id/4) +b pgid; wherein a and b are respectively preset weighting coefficients corresponding to floor (SFN_id/4) and pg_id, and floor (x) takes a value of a maximum integer smaller than x.

Preferably, a=1, b=max {1+a floor (sfn_id/4) } =floor (sfn_id/4) +1.

An information generation method, comprising:

the base station receives a random access preamble sent by User Equipment (UE);

the base station calculates RA-RNTI according to the group index of the preamble group where the received random access preamble is located and the resource position of the random access resource bearing the random access preamble;

wherein the preamble group is a group of available random access preambles corresponding to random access resources.

An information generating apparatus, comprising: a transmitting unit and a calculating unit;

the sending unit is used for sending a random access preamble to the base station;

the calculating unit is used for calculating RA-RNTI according to the group index of the preamble group where the transmitted random access preamble is located; wherein the preamble group is a group of available random access preambles corresponding to random access resources.

An information generating apparatus, comprising: a receiving unit and a calculating unit;

the receiving unit is configured to receive a random access preamble sent by a user equipment UE;

the calculating unit is used for calculating RA-RNTI according to the group index of the preamble group where the received random access preamble is located and the resource position of the random access resource carrying the random access preamble;

As can be seen from the above technical solution, in the present application, a random access resource is pre-corresponding, and a plurality of available random access preambles are grouped to obtain the preamble group; and calculating the RA-RNTI according to the group index of the preamble group where the random access preamble sent by the UE is located and the resource position of the random access resource carrying the random access preamble. By the method, the users selecting different downlink transmission beams can be distinguished, and different users adopting the same random access resource can be distinguished, so that the detection efficiency of random access response is improved.

Drawings

Fig. 1 is a schematic diagram of a contention-based random access procedure in LTE-a;

fig. 2a is a schematic diagram of a UE-side processing flow of the information generating method in the present application;

fig. 2b is a schematic diagram of a base station side processing flow of the information generating method in the present application;

fig. 3 is a schematic diagram of mapping relationship between downlink transmission beam and random access time-frequency resource in the first embodiment;

fig. 4 is a diagram of a preamble packet corresponding to a random access resource in the first embodiment;

fig. 5 is a schematic diagram of mapping relationship between a synchronization signal block and a random access resource in the second embodiment;

Fig. 6 is a diagram of a preamble packet corresponding to a random access resource in the second embodiment;

fig. 7 is a schematic diagram of mapping relationship between downlink transmission beam and random access time-frequency resource in the fourth embodiment;

fig. 8 is a diagram of a preamble packet corresponding to a random access resource in the fourth embodiment;

fig. 9 is a schematic diagram of mapping relationship between downlink transmission beam and random access time-frequency resource in the fifth embodiment;

fig. 10 is a diagram of a preamble packet corresponding to a random access resource in a fifth embodiment;

fig. 11 is a schematic basic structure diagram of a UE-side apparatus for information generation in the present application;

fig. 12 is a schematic basic structure diagram of a base station side device for information generation in the present application.

Detailed Description

In order to make the objects, technical means and advantages of the present application more apparent, the present application is further described in detail below with reference to the accompanying drawings.

In future 5G communication systems, the network may use a beamforming system and the base station may transmit signals to the user using different downlink transmission beams. Because the transmission performance of different downlink transmission beams is different, the user can select a downlink transmission beam with better receiving effect from a plurality of different downlink transmission beams according to the detection of the downlink signal and inform the base station, and then the base station can send signals to the user by using the downlink transmission beam in subsequent transmission so as to improve the transmission performance. In a 5G communication system, multiple downlink transmission beams are bonded with the same random access time-frequency resource. At this time, in order to enable the network side to distinguish the downlink transmission beam selected by the user through the detected resources and the preamble, it may be considered to group the available random access preambles, and bind with different downlink transmission beams using different packet indexes. However, if the existing RA-RNTI generation scheme is still followed, the user is additionally wasted detecting random preambles of other groups.

To solve the above problem, the present application provides a way to generate information, and uses a new way to generate RA-RNTI. In a multi-beam transmission system, the system transmits information such as a broadcast message or a synchronization signal through a plurality of downlink transmission beams, and the plurality of downlink transmission beams are bound to the same random access resource, wherein random access preambles are grouped in the random access resource, and different downlink transmission beams are indicated by different groups. The invention provides a new method for generating a random access wireless network temporary identifier by constructing, which calculates and generates RA-RNTI by utilizing the time-frequency resource position used by random access and the grouping index of a selected preamble. Thus, when searching for possible RAR, the user can automatically exclude the random access responses of different preamble groups using the same time-frequency resource through the generated RA-RNTI, thereby saving the user searching cost and time delay. And the base station uses different random access wireless network temporary identifiers to distinguish the users selecting different downlink transmission beams in the random access response through the detected random access preamble.

When the user reads the configuration information of random access through the downlink channel, after obtaining the corresponding random access time-frequency resource and the corresponding random access lead code (namely the random access lead sequence) grouping, the random access lead code is sent on the selected random access time-frequency resource. After a period of time when the preamble is transmitted, the user needs to search for a possible random access response according to the random access response window size, which is indicated by the RA-RNTI. Unlike conventional approaches, the proposed calculation of RA-RNTIs is related to the resource location of a given random access channel (Physical Random Access Channel, PRACH) and the packet index of the random access preamble packets available on that random access channel.

The resource locations of the random access channels used in calculating the RA-RNTI may be different in different systems.

In the 5G system, the corresponding resource positions may refer to index information t_id of a starting time unit and index information f_id of a starting frequency unit where the PRACH channel used by the transmitted random access preamble is located. The index information t_id of the time unit may be an index value of the time unit where the starting position of the PRACH channel is located, for example, a starting subframe index (subframe index) in a Radio frame where the starting position of the PRACH channel is located, and the value range of t_id is 0 to M, that is, (0+.t_id < m+1), or the index information t_id may be determined according to index values in a plurality of time units where the starting position of the PRACH channel is located, for example, according to an index of the Radio frame where the starting position of the PRACH channel is located and an index of a subframe where the PRACH channel is located. Similarly, the index information f_id of the frequency unit may be an index value of the frequency unit where the PRACH channel start position is located, for example, a PRB index of the PRB where the PRACH channel start position is located, and the value of f_id ranges from 0 to N, that is, (0+.f_id < n+1), or the index information f_id may be determined according to the index values of the PRACH channel start position in a plurality of frequency units, for example, the index of the PRB where the PRACH channel is located and the subcarrier index. M and N are both non-negative integers.

In enhanced machine communication (enhanced Machine type communication, eMTC), the respective resource locations may include index information sfn_id of a first time unit in which the random access channel is located (e.g., an index of a first radio frame in which the random access channel is located), index information t_id of a second time unit in the first time unit in which the random access channel is located (e.g., a subframe index in the first radio frame), and index information f_id of a frequency unit in which the random access channel is located.

In a narrowband internet of things system (NB-IOT), the corresponding resource location may be an index sfn_id of a first time unit in which the random access channel is located (e.g., an index of a first radio frame in which the random access channel is located).

The packet index of the random access preamble packet refers to the packet pg_id of the random access preamble to which the transmitted random access preamble corresponds, where the random access preamble packet is only specific to the random access time-frequency resource selected by the user, and the value range of pg_id is 0 to P, that is, (0 is less than or equal to pg_id < p+1). P is a non-negative integer. It should be noted that, since the preamble packet is also a downlink transmission beam selected by the base station user, the preamble packet is bound to the downlink transmission beam, and the preamble packet index may be an index of a downlink transmission beam (Downlink Transmission beam, DL Tx beam), or an index of a synchronization signal block (Synchronization Signal block, SS block), or an index of a physical broadcast signal (PBCH) when calculating the RA-RNTI. In addition, the preamble set may be composed of different preamble root sequences (root sequences) packets, or of a preamble sequence and different orthogonal cover code words (Orthogonal Cover Code, OCC), or of a preamble sequence and different Cyclic Shifts (CS), in addition to the direct grouping of the preamble set. Thus, the preamble grouping index may also be a different root sequence grouping index, an orthogonal cover codeword index, or a different cyclic shift index.

In summary, the basic flow of the information generating method in the present application is shown in fig. 2a and fig. 2b, where fig. 2a is a processing flow on the UE side, and specifically includes:

step 201a, UE sends random access preamble;

in step 202a, the ue calculates RA-RNTI according to the packet index of the preamble packet in which the transmitted random access preamble is located and the resource location of the random access resource carrying the random access preamble.

Wherein the preamble group is a group of available random access preambles of corresponding random access resources. Specifically, the random access resource can be pre-corresponding, and the preamble code group is obtained after grouping a plurality of available random access preamble codes.

Fig. 2b is a processing flow at the base station side, specifically including:

step 201b, the base station receives a random access preamble;

in step 202b, the base station calculates RA-RNTI according to the packet index of the preamble packet in which the received random access preamble is located and the resource location of the random access resource carrying the random access preamble.

Wherein the preamble group is a group of available random access preambles of corresponding random access resources. Specifically, the preamble group may be obtained by grouping a plurality of available random access preambles corresponding to random access resources in advance.

In a communication system such as 5G, the calculation method of RA-RNTI may be:

RA-rnti=1+a×t_id+b×f_id+c×pg_id (1), where t_id, f_id represent index information of a time unit and index information of a frequency unit where a starting position of a random access channel is located, for example, represent a starting position of the random access channel in time in one radio frame, and a starting position in a frequency domain, respectively. the t_id may be a subframe index (subframe index), a slot index (slot index), a mini-slot index (mini-slot index), a symbol group index (symbol-group index), a symbol index (symbol index), or an index determination according to the above-mentioned time units, such as a slot index under one subframe index, or a symbol index under a slot index; the f_id may be a physical resource block group index (PRB-group index), a physical resource block index (PRB index), a subcarrier index (subcarrier index), a subcarrier group index (subcarrier group index), or an index determined according to the above-mentioned plurality of frequency units, for example, a subcarrier index under one physical resource block index.

The values of a, b and c are coefficients of t_id, f_id and pg_id respectively, and the values of a, b and c are required to meet a condition that the RA-RNTI and { t_id, f_id, pg_id } are required to be uniquely corresponding, the value of the unique RA-RNTI can be calculated from the values of a group of { t_id, f_id, pg_id }, and conversely, the unique value of { t_id, f_id, pg_id } can be calculated from the value of one RA-RNTI. One possible design is: a is 1, b is 1+a t_id, and c is 1+a t_id+b f_id, i.e.

a＝1,

b＝max{1+a*t_id}＝M+1,

c＝max{1+a*t_id+b*f_id}＝(M+1)(N+1)。

For example, m= 9,N =5, the RA-RNTI is calculated by:

RA-RNTI＝1+t_id+10*f_id+60*pg_id (2)

therefore, when the RA-RNTI has a value of 32, a unique value t_id=1, f_id=3, and pg_id=0 can be calculated.

After the UE calculates the RA-RNTI in the manner shown in fig. 2a, the RA-RNTI is used to detect the random access response sent by the base station. After the base station calculates the RA-RNTI in the manner shown in fig. 2b, the RA-RNTI is used to scramble the random access response and send the random access response to the UE.

The RA-RNTI generated by the method can reflect the downlink transmission beam selected by the user and improve the detection efficiency of the random access response. Specific implementations of the methods of the present application are described below by way of several examples.

Example 1

In this embodiment, corresponding to a random access resource, the available random access preamble codes are grouped to obtain preamble code groups, and the preamble code groups and the downlink transmission beams are bound one to one, so that the random access preamble codes can be selected from the corresponding preamble code groups according to the downlink transmission beams selected by the user to perform random access, and the base station can distinguish the downlink transmission beams selected by the UE through the selected random access preamble codes.

Specifically, the base station will use different downlink transmission beams to send the broadcast message and the synchronization signal, and the different downlink transmission beams will be bound to the designated random access resource, where in one case, multiple downlink transmission beams will be bound to the same random access time-frequency resource, as in fig. 3, the downlink transmission beam 1 and the downlink transmission beam 2 are mapped to the same random access time-frequency resource.

At this time, if the base station can acquire the downlink transmission beam direction selected by the user through the detection of the random access message 1, it is necessary to group different preamble sets. Assuming that for downlink transmission beam 1 and downlink transmission beam 2, there are x=64 total available random access preambles, this preamble set is divided into two groups, where group 0 contains a preambles (a < 64) bound to downlink transmission beam direction 1, group 1 contains B preambles (B <64, a+b+.ltoreq.64) bound to downlink transmission beam direction 2, i.e. when the preamble detected by the base station on the corresponding random access resource is belonging to group 0 preamble packet, the base station is implicitly informed that the user transmitting the preamble selects downlink transmission beam 1, and similarly, when the preamble detected by the base station on the corresponding random access resource is belonging to group 1 preamble packet, the base station is implicitly informed that the user transmitting the preamble selects downlink transmission beam 2.

It is noted that the "corresponding random access resource" refers to a random access resource to which the corresponding one or more downlink beams are mapped. The same random access preamble may belong to different preamble groups in different mapped random access resources, as shown in fig. 4, in the random access resources corresponding to downlink transmission beams 1 and 2, the preamble set is divided into 2 groups, and the preamble 32 belongs to the 1 st preamble group; in the random access resource corresponding to the downlink transmission beam 3, the preamble set is a group, and the preamble 32 belongs to the preamble group 0.

When the base station successfully detects a random access preamble, a random access response needs to be sent to the preamble, and the random access response needs to be sent to perform scrambling operation by using the RA-RNTI. For example, the system is set to have 10 subframes in one radio frame, the t_id is marked by a subframe index, that is, the value range is 0 to 9, that is (0.ltoreq.t_id < 10), the random access resource has 6 PRBs in the frequency domain, the f_id is marked by a physical resource block index, that is, the value range is 0 to 5, that is (0.ltoreq.f_id < 6), and the RA-RNTI is calculated by adopting the mode of the formula (2):

RA-RNTI＝1+t_id+10*f_id+60*pg_id。

if the user downlink measurement finds that the signal strength of the downlink beam 2 to itself is the largest (i.e. the RSRP measured by the downlink transmission beam 2 is the largest), the user selects a random access time-frequency resource corresponding to the downlink beam 2, where the starting position of the random access time-frequency resource is the 2 nd subframe of the time domain and the 3 rd PRB of the frequency domain, and selects the preamble 32 from the preamble packet 1 to transmit, i.e. t_id=2, f_id=3, and pg_id=1. The final base station successfully detects the random access preamble 32 on the random access time-frequency resource of the 2 nd subframe taking the initial position as the time domain and the 3 rd frequency domain position of the frequency domain, and performs random access response on the preamble 32, and scrambles by using the RA-RNTI, and then the value of the RA-RNTI at the moment is as follows:

RA-RNTI＝1+2+10*3+60*1＝93。

Meanwhile, the user can generate the same RA-RNTI value by using the same generation mode, so that the corresponding PDCCH can be descrambled to search possible random access response therein.

As can be seen from the foregoing, in this embodiment, the random access resource is determined according to the downlink transmission beam selected by the UE based on the downlink measurement; the random access preamble transmitted by the UE is selected from preamble packets corresponding to the random access resources and bonded with the downlink transmission beam selected by the UE based on the downlink measurements.

Example two

In this embodiment, corresponding to a random access resource, the available random access preamble is grouped to obtain a preamble group, and the preamble group is bound with a physical broadcast signal or a synchronization signal block in one-to-one manner, so that the random access preamble can be selected from the corresponding preamble group according to the physical broadcast signal or the synchronization signal block selected by the user to perform random access, and the base station can distinguish the downlink transmission beam selected by the UE through the selected random access preamble.

Next, the embodiment will introduce a new RA-RNTI generating manner proposed in the present application based on the downlink channel/signal (e.g., synchronization signal block, broadcast) through a specific flow.

Specifically, the base station will use different downlink transmission beams to send the broadcast message and the synchronization signal, and the sent synchronization signal block or broadcast channel will be bound to the designated random access resource, where in one case, multiple synchronization signal blocks will be bound to the same random access time-frequency resource, as in fig. 5, synchronization signal block 1 and synchronization signal block 2 are mapped to the same random access time-frequency resource.

At this time, if the base station can acquire the downlink transmission beam direction preferred by the user through the detection of the random access message 1, different preamble sets need to be grouped. Assuming that for downlink transmission beam 1 and downlink transmission beam 2 there are x=64 total available random access preambles, this preamble set is divided into two groups, wherein group 0 contains a preambles (a < 64) bound to synchronization signal block 1, group 1 contains B preambles (B <64, a+b+.ltoreq.64) bound to synchronization signal block 2, i.e. when the preamble detected by the base station on the corresponding random access resource belongs to group 0 preamble packet, the base station is implicitly informed that the user sending the preamble prefers synchronization signal block 1, i.e. downlink transmission beam 1, and similarly, when the preamble detected by the base station on the corresponding random access resource belongs to group 1 preamble packet, the base station is informed that the user sending the preamble prefers synchronization signal block 2, i.e. downlink transmission beam 2.

It is noted that the "corresponding random access resource" refers to a random access resource to which the corresponding one or more downlink beams are mapped. The same random access preamble may belong to different preamble groups in different mapped random access resources, as shown in fig. 6, in the random access resources corresponding to the synchronization signal blocks 1 and 2, the preamble set is divided into 2 groups, and the preamble 32 belongs to the preamble group 1; and in the random access resource corresponding to the synchronization signal block 3, the preamble set is a group, and the preamble 32 belongs to the preamble group 0.

When the base station successfully detects a random access preamble, a random access response needs to be sent to the preamble, and the random access response needs to be sent to perform scrambling operation by using the RA-RNTI. For example, in this case, the system is set to have 10 subframes in one radio frame, that is, the value range of t_id is 0 to 9, that is (0+.t_id < 10), and there are 6 positions on the frequency domain of the random access resource, that is, the value range of f_id is 0 to 5, that is (0+.f_id < 6), and then the calculation mode of the RA-RNTI adopts the mode of equation (2):

RA-RNTI＝1+t_id+10*f_id+60*pg_id。

if the user downlink measurement finds that the signal strength of the synchronization signal block 2 sent in the downlink beam direction 2 is the largest for the user, the user selects a random access time-frequency resource corresponding to the synchronization signal block 2, wherein the starting position of the random access time-frequency resource is the 2 nd subframe of the time domain and the 3 rd PRB of the frequency domain, and the preamble 32 is selected from the preamble packet 1 corresponding to the random access resource to send, namely t_id=2, f_id=3, and pg_id=1. The final base station successfully detects the random access preamble 32 on the random access time-frequency resource of the 2 nd subframe taking the initial position as the time domain and the 3 rd frequency domain position of the frequency domain, and performs random access response on the preamble 32, and scrambles by using the RA-RNTI, and then the value of the RA-RNTI at the moment is as follows:

RA-RNTI＝1+2+10*3+60*1＝93。

As can be seen from the foregoing, in this embodiment, the random access resource is determined according to the physical broadcast signal or the synchronization signal block selected by the UE based on the downlink measurement; the random access preamble transmitted by the UE is selected among preamble packets corresponding to the random access resources and bonded with the physical broadcast signal or synchronization signal block selected by the UE based on the downlink measurement.

Example III

In this embodiment, a grouping method of preamble grouping and a specific value-taking method of preamble grouping index are described. Based on the grouping mode and the grouping index value mode in the embodiment and combined with the RA-RNTI calculating mode in the first or second embodiment, more various choices can be provided for calculating the RA-RNTI.

In the previous embodiment, the different preamble sets are grouped directly, in this embodiment, in addition to the preamble sets being grouped directly, the preamble sets may be composed of different preamble root sequences (root sequences) groups, or composed of preamble sequences and different orthogonal cover codewords (Orthogonal Cover Code, OCC), or composed of the preamble sequences and different Cyclic Shifts (CS). Thus, the preamble grouping can be performed based on the preamble root sequence, the orthogonal cover codeword, and the cyclic shift, and the preamble grouping index can be a different root sequence grouping index, an orthogonal cover codeword index, or a different cyclic shift index.

The base station will use different downlink transmission beams to send the broadcast message and the synchronization signal, and the different downlink beams will be bound to the designated random access resource, in which case multiple downlink transmission beams will be bound to the same random access time-frequency resource, as in fig. 3, downlink transmission beam 1 and downlink transmission beam 2 are mapped to the same random access time-frequency resource.

At this time, if the base station is to obtain the downlink transmission beam direction preferred by the user through the detection of the random access message 1, the preamble set needs to be grouped. The grouping of the preambles may be any of the following four:

1. the available random access preambles will be directly grouped.

For example, assuming that for downlink transmission beam 1 and downlink transmission beam 2, there are x=64 total available random access preambles, this preamble set is divided into two groups, where group 0 contains a preambles (a < 64) bound to downlink transmission beam direction 1, group 1 contains B preambles (B <64, a+b+.ltoreq.64) bound to downlink transmission beam direction 2, i.e. when the preamble detected by the base station on the corresponding random access resource is of group 0 preamble packet, the base station is implicitly informed that the user transmitting the preamble prefers to downlink transmission beam 1, and similarly, when the preamble detected by the base station on the corresponding random access resource is of group 1 preamble packet, the base station is implicitly informed that the user transmitting the preamble prefers to downlink transmission beam 2.

2. The available random access preambles are grouped according to the root value of the preamble. Specifically, grouping all preamble root sequences corresponding to available random access codes; dividing the random access lead codes generated by the lead code root sequences of the same group into the same group when grouping the available random access lead codes; the packet index of the preamble packet is: and generating a root sequence packet index of a packet in which a preamble root sequence of the random access preamble is located. That is, in this embodiment, the preamble group is determined based on a preamble root sequence group to which a preamble root sequence used by an available random access preamble belongs, wherein random access preambles determined using the same group of preamble root sequences belong to the same preamble group.

For example, assume that for downlink transmission beam 1 and downlink transmission beam 2, there are x=64 total available random access preambles, where the preamble root sequence used is only X ' =32, and this preamble set is divided into two groups based on the root sequence, i.e. where the 0 th group contains a ' (a ' < 32) preamble root sequences (while the preambles generated based on this a ' root sequence in all 64 preambles) bound to downlink transmission beam direction 1, the 1 st group contains B ' (B ' <32, a ' +b ' +.ltoreq.32) preamble root sequences (while the preambles generated based on this B ' root sequences in all 64 preambles) bound to downlink transmission beam direction 2, i.e. when the preamble detected by the base station on the corresponding random access resource is a preamble root sequence packet belonging to the 0 th group, the base station is implicitly informed that the base station transmits the preamble with preference for downlink transmission beam 1, i.e. when the preamble detected by the base station on the corresponding random access resource is the preamble root sequence belonging to the implicit base station 1.

3. The available random access preambles are grouped according to occ. Specifically, grouping each orthogonal cover code word corresponding to the available random access code; dividing the random access preamble codes generated by using the same group of orthogonal cover code words into the same group when grouping the available random access preamble codes; the packet index of the preamble packet is: an orthogonal cover code word grouping index of a group in which an orthogonal cover code word of the random access preamble is located is generated. That is, in this embodiment, the preamble group is determined based on the orthogonal cover codeword group to which the orthogonal cover codeword used for the available random access preamble belongs, wherein the random access preambles determined using the same set of orthogonal cover codewords belong to the same preamble group.

For example, assume that for downlink transmission beam 1 and downlink transmission beam 2, there are x=64 total available random access preambles, wherein only X ' =8 Orthogonal Cover Codes (OCC) are used, and this set of preambles is divided into two groups based on the orthogonal cover codes, i.e., wherein group 0 contains a ' (a ' < 8) orthogonal cover codes (while the preamble generated based on this a ' orthogonal cover codes among all 64 preambles) bound to downlink transmission beam direction 1, group 1 contains B ' (B ' <8, a ' +b ' +.ltoreq.8) orthogonal cover codes (while the preamble generated based on this B ' orthogonal cover codes among all 64 preambles) bound to downlink transmission beam direction 2, i.e., when the preamble detected by the base station on the corresponding random access resource is a preamble packet belonging to group 0, the base station is implicitly informed of the preference of the user of transmitting this preamble beam to downlink transmission beam 1, i.e., the preamble detected by the base station on the corresponding random access resource is an implicit access resource belonging to group 2.

4. The available random access preambles are grouped according to cyclic shift. Specifically, grouping each cyclic shift value corresponding to the available random access code; when grouping available random access preambles, the random access preambles corresponding to the same group of cyclic shift values when generating the random access preambles can be divided into the same group; the packet index of the preamble packet is: and generating a cyclic shift packet index of the packet where the corresponding cyclic shift value is located when the random access preamble is generated. That is, the preamble packet is determined based on a cyclic shift packet to which a cyclic shift value used by an available random access preamble belongs, wherein random access preambles determined using the same set of cyclic shift values belong to the same preamble packet.

For example, assume that for downlink transmission beam 1 and downlink transmission beam 2, there are x=64 total available random access preambles, wherein the available Cyclic Shift (CS) is only X ' =6, and this preamble set is divided into two groups on the basis of cyclic shift, i.e. wherein group 0 contains a ' (a ' < 6) cyclic shifts (while the preamble generated based on this a ' cyclic shift among all 64 preambles) bound to downlink transmission beam direction 1, group 1 contains B ' (B ' <6, a ' +b ' +.ltoreq.6) cyclic shifts (while the preamble generated based on this B ' cyclic shift among all 64 preambles) bound to downlink transmission beam direction 2, i.e. when the preamble detected by the base station on the corresponding random access resource is a cyclic shift packet belonging to group 0, the base station is implicitly informed of the preference of the user who transmitted the preamble on downlink transmission beam 1, and likewise, when the base station detects that the preamble generated on the corresponding random access resource is a cyclic shift belonging to group 1, the base station is implicitly informed of the preference of the downlink transmission beam 2.

It is noted that the "corresponding random access resource" refers to a random access resource to which the corresponding one or more downlink beams are mapped. The same random access preamble may belong to different preamble groups in different mapped random access resources, as shown in fig. 3, in the random access resources corresponding to downlink transmission beams 1 and 2, the preamble set is divided into 2 groups, and the preamble 32 belongs to the 1 st preamble group; in the random access resource corresponding to the downlink transmission beam 3, the preamble set is a group, and the preamble 32 belongs to the preamble group 0.

When the base station successfully detects a random access preamble, a random access response needs to be sent to the preamble, and the random access response needs to be sent to perform scrambling operation by using the RA-RNTI. For example, in this case, the system is set to have 10 subframes in one radio frame, that is, the subframe index is marked by t_id, that is, the value range is 0 to 9, that is, (0.ltoreq.t_id < 10), the frequency domain of the random access resource has 6 PRBs, the value range is marked by f_id, that is, the PRB index is 0 to 5, that is, (0.ltoreq.f_id < 6), and the calculation mode of the RA-RNTI adopts the mode shown in the formula (2):

RA-RNTI＝1+t_id+10*f_id+60*pg_id。

If the user downlink measurement finds that the signal strength of the downlink beam 2 to itself is the largest (i.e. the RSRP measured by the downlink transmission beam 2 is the largest), the user selects a random access time-frequency resource corresponding to the downlink beam 2, where the starting position of the random access time-frequency resource is the 2 nd subframe of the time domain and the 3 rd PRB of the frequency domain, and the preamble 32 is selected for transmission in the preamble packet 1, i.e. t_id=2, f_id=3, and pg_id=1. The final base station successfully detects the random access preamble 32 on the random access time-frequency resource of the 2 nd subframe taking the initial position as the time domain and the 3 rd frequency domain position of the frequency domain, and performs random access response on the preamble 32, and scrambles by using the RA-RNTI, and then the value of the RA-RNTI at the moment is as follows:

RA-RNTI＝1+2+10*3+60*1＝93。

Example IV

In the communication system, different random access resources available for users to select may not be different in the time domain, but may be different only in the frequency domain, and the embodiment provides a generation mode of RA-RNTI for the random access resources.

The base station will use different downlink transmission beams to send the broadcast message and the synchronization signal, and the different downlink beams will be bound to the designated random access resource, in which case multiple downlink transmission beams will be bound to the same random access time-frequency resource, as in fig. 7, downlink transmission beam 1 and downlink transmission beam 2 are mapped to the same random access time-frequency resource. Meanwhile, in a special case, when the system is not configured with random access resources in different time, that is, random access time-frequency resources corresponding to the downlink transmission beam are only distinguished in the frequency domain.

At this time, if the base station can acquire the downlink transmission beam direction selected by the user through the detection of the random access message 1, it is necessary to group different preamble sets. Assuming that for downlink transmission beam 1 and downlink transmission beam 2 there are x=64 total available random access preambles, this preamble set is divided into two groups, wherein group 0 contains a preambles (a < 64) bound to downlink transmission beam direction 1, group 1 contains B preambles (B <64, a+b+.ltoreq.64) bound to downlink transmission beam direction 2, i.e. when the preamble detected by the base station on the corresponding random access resource is belonging to group 0 preamble packet, the base station is implicitly informed that the user transmitting the preamble prefers to downlink transmission beam 1, and similarly, when the preamble detected by the base station on the corresponding random access resource is belonging to group 1 preamble packet, the base station is implicitly informed that the user transmitting the preamble prefers to downlink transmission beam 2.

It is noted that the "corresponding random access resource" refers to a random access resource to which the corresponding one or more downlink beams are mapped. The same random access preamble may belong to different preamble groups in different mapped random access resources, as shown in fig. 8, in the random access resources corresponding to downlink transmission beams 1 and 2, the preamble set is divided into 2 groups, and the preamble 32 belongs to the 1 st preamble group; in the random access resource corresponding to the downlink transmission beam 3, the preamble set is a group, and the preamble 32 belongs to the preamble group 0.

When the base station successfully detects a random access preamble, a random access response needs to be sent to the preamble, and the random access response needs to be sent to perform scrambling operation by using the RA-RNTI. For example, since the time positions (subframe index numbers) of the random access resources of the system are all the same, the time positions are not included in the RA-RNTI calculation scheme, that is, the t_id is set to 0 in the calculation scheme given by the above formula (1). For example, assuming that there are 6 PRBs in the frequency domain of the set random access resource of the system, that is, the value range of f_id is 0 to 5, that is, (0+.f_id < 6), the RA-RNTI is calculated in the following manner:

RA-RNTI＝1+f_id+6*pg_id。

if the user downlink measurement finds that the signal strength of the downlink beam 2 to itself is the largest (i.e. the RSRP measured by the downlink transmission beam 2 is the largest), the user selects a random access time-frequency resource corresponding to the downlink beam 2, where the starting position of the random access time-frequency resource is the 3 rd PRB of the frequency domain, and selects the preamble 32 from the preamble packet 1 to transmit, i.e. f_id=3, and pg_id=1. The final base station successfully detects the random access preamble 32 on the random access time-frequency resource of the 3 rd frequency domain position taking the initial position as the frequency domain, and performs random access response on the preamble 32, and scrambles by using the RA-RNTI, and then the value of the RA-RNTI is as follows:

RA-RNTI＝1+3+6*1＝10。

The preamble packet and the preamble index in the present embodiment may be the manner in the third embodiment, and may be a physical broadcast signal or a synchronization signal block, which is bound to the preamble packet.

Example five

In the communication system, different random access resources available for users to select may not be different in the frequency domain, but may be different only in the time domain, and the embodiment provides a generation mode of RA-RNTI for the random access resources.

The base station will use different downlink transmission beams to send the broadcast message and the synchronization signal, and the different downlink beams will be bound to the designated random access resource, in which case, multiple downlink transmission beams will be bound to the same random access time-frequency resource, as in fig. 9, downlink transmission beam 1 and downlink transmission beam 2 are mapped to the same random access time-frequency resource. Meanwhile, in a special case, when the system is not configured with random access resources at different frequency domain positions, that is, random access time-frequency resources corresponding to downlink transmission beams are only distinguished at time domain positions.

It is noted that the "corresponding random access resource" refers to a random access resource to which the corresponding one or more downlink beams are mapped. The same random access preamble may belong to different preamble groups in different mapped random access resources, as shown in fig. 10, in the random access resources corresponding to downlink transmission beams 1 and 2, the preamble set is divided into 2 groups, and the preamble 32 belongs to the 1 st preamble group; in the random access resource corresponding to the downlink transmission beam 3, the preamble set is a group, and the preamble 32 belongs to the preamble group 0.

When the base station successfully detects a random access preamble, a random access response needs to be sent to the preamble, and the random access response needs to be sent to perform scrambling operation by using the RA-RNTI. For example, since the frequency domain positions (frequency domain index numbers) of the random access resources of the system are all the same at this time, the frequency domain positions are not included in the RA-RNTI calculation scheme, that is, the calculation scheme given by the above formula (1), and f_id is set to 0. At this time, the system is set to have 10 subframes in one radio frame, namely, the value range of t_id is 0 to 9, namely (0 is less than or equal to t_id < 10), and the calculation mode of RA-RNTI is as follows:

RA-RNTI＝1+t_id+10*pg_id。

if the user downlink measurement finds that the signal strength of the downlink beam 2 to itself is the largest (i.e. the RSRP measured by the downlink transmission beam 2 is the largest), the user selects a random access time-frequency resource corresponding to the downlink beam 2, where the starting position of the random access time-frequency resource is the 5 th subframe of the time domain, and selects the preamble 32 from the preamble packet 1 to transmit, i.e. t_id=5, pg_id=1. The final base station successfully detects the random access preamble 32 on the random access time-frequency resource of the 5 th subframe taking the initial position as the time domain, and performs random access response on the preamble 32, and scrambles by using the RA-RNTI, and then the value of the RA-RNTI is as follows:

RA-RNTI＝1+5+10*1＝16。

Example six

Embodiments will introduce a specific procedure for generating a new RA-RNTI based on a preamble index (preamble_index) according to the present application. Specifically, in the present embodiment, the preamble index is taken as a preamble group index, or it can be considered that each available random access preamble is taken as one preamble group when the preambles are grouped. In this case, when the preamble packet and the downlink transmission beam are bonded, the bonding may be one-to-one bonding or many-to-one bonding.

The base station will use different downlink transmission beams to send the broadcast message and the synchronization signal, and the different downlink beams will be bound to the designated random access resource, in which case multiple downlink transmission beams will be bound to the same random access time-frequency resource, as in fig. 2, downlink transmission beam 1 and downlink transmission beam 2 are mapped to the same random access time-frequency resource.

It is noted that the "corresponding random access resource" refers to a random access resource to which the corresponding one or more downlink beams are mapped. The same random access preamble may belong to different preamble groups in different mapped random access resources, as shown in fig. 2, in the random access resources corresponding to downlink transmission beams 1 and 2, the preamble set is divided into 2 groups, and the preamble 32 belongs to the 1 st preamble group; in the random access resource corresponding to the downlink transmission beam 3, the preamble set is a group, and the preamble 32 belongs to the preamble group 0.

When the base station successfully detects a random access preamble, a random access response needs to be sent to the preamble, and the random access response needs to be sent to perform scrambling operation by using the RA-RNTI. For example, in this case, the system is set to have 10 subframes in one radio frame, where t_id is a subframe index and the value range is 0 to 9, i.e., (0+.t_id < 10), 6 PRBs are on the frequency domain of the random access resource, and f_id is a PRB index and the value range is 0 to 5, i.e., (0+.f_id < 6). At this time, the RA-RNTI is calculated by directly using the index of the preamble, which may be considered as a special case of the preamble grouping, i.e., 64 total preambles are divided into 64 groups, groups 0 to 31 indicate downlink transmission beam 1 (i.e., groups 0 to 31 are bonded with downlink transmission beam 1), and groups 32 to 63 indicate downlink transmission beam 2 (i.e., groups 32 to 63 are bonded with downlink transmission beam 2). Therefore, pg_id=preamble_index, and the calculation of RA-RNTI is performed in the manner of formula (2), that is:

RA-RNTI＝1+t_id+10*f_id+60*preamble_id。

if the user downlink measurement finds that the signal strength of the downlink beam 2 to itself is the largest (i.e. the RSRP measured by the downlink transmission beam 2 is the largest), the user selects a random access time-frequency resource corresponding to the downlink beam 2, where the starting position of the random access time-frequency resource is the 2 nd subframe of the time domain and the 3 rd PRB of the frequency domain, and selects the preamble 32 from the preamble set to transmit, i.e. t_id=2, f_id=3, and preamble_id=32. The final base station successfully detects the random access preamble 32 on the random access time-frequency resource of the 2 nd subframe taking the initial position as the time domain and the 3 rd frequency domain position of the frequency domain, and performs random access response on the preamble 32, and scrambles by using the RA-RNTI, and then the value of the RA-RNTI at the moment is as follows:

RA-RNTI＝1+2+10*3+60*32＝1952。

Example seven

In this embodiment, a specific process of generating RA-RNTI by applying the present application in the EMTC system will be described.

When the user reads the configuration information of random access through the downlink channel, after obtaining the corresponding random access time-frequency resource and the corresponding random access lead code (namely the random access lead sequence) grouping, the random access lead code is sent on the selected random access time-frequency resource. After a period of time when the preamble is transmitted, the user needs to search for a possible random access response according to the random access response window size, which is indicated by the RA-RNTI. Unlike conventional computing in eMTC systems, the proposed method of computing RA-RNTI is related to the time-frequency resource location of a given random access channel (Physical Random Access Channel, PRACH), the index of the first time element in which the random access channel is located (e.g., index sfn_ id (index of the first radio frame of the given PRACH) of the first radio frame), and the packet index of the random access preamble packet available on the random access channel.

The resource location of the random access channel refers to an index of a first time unit (for example, a first Radio frame (Radio frame) index) where the PRACH channel used by the transmitted random access preamble is located, index information t_id (for example, subframe index) of a second time unit (for example, in a Radio frame) where the PRACH channel is located, and index information f_id of a starting frequency unit. The second time unit t_id of the present embodiment is the same as t_id of the foregoing embodiment, that is, t_id may be an index of a time unit, or may be an index combination of a plurality of different time unit indexes, for example, when t_id is identified as a subframe index, the value range of t_id is 0 to M, that is, 0+_t_id < m+1, and f_id is the same as f_id of the foregoing embodiment, for example, when f_id is identified as a PRB index, the value range is 0 to N, that is, 0+_id < n+1.M and N are both non-negative integers.

The packet index of the random access preamble packet refers to a packet pg_id of the random access preamble to which the transmitted random access preamble corresponds, where the random access preamble packet is only specific to the random access time-frequency resource selected by the user, and the value range of pg_id is 0 to P, that is, (0 is less than or equal to pg_id is less than p+1). P is a non-negative integer. It should be noted that, since the preamble packet is also a downlink transmission beam selected by the base station user, the preamble packet is bound to the downlink transmission beam, and the preamble packet index may be an index of a downlink transmission beam (Downlink Transmission beam, DL Tx beam), or an index of a synchronization signal block (Synchronization Signal block, SS block), or an index of a physical broadcast signal (PBCH) when calculating the RA-RNTI. In addition, the preamble set may be composed of different preamble root sequences (root sequences) packets, or of a preamble sequence and different orthogonal cover code words (Orthogonal Cover Code, OCC), or of a preamble sequence and different Cyclic Shifts (CS), in addition to the direct grouping of the preamble set. Thus, the preamble grouping index may also be a different root sequence grouping index, an orthogonal cover codeword index, or a different cyclic shift index.

The RA-RNTI can be calculated by the following steps:

RA-RNTI＝1+a*t_id+b*f_id+c*(SFN_id mod(Wmax/10))+d*pg_id

the values of a, b, c and d are coefficients of t_id, f_id, (SFN_id mod (Wmax/10)) and pg_id, and the values of a, b, c and d meet a condition that the values of RA-RNTI and { t_id, f_id, (SFN_id mod (Wmax/10)) can be uniquely corresponding to the values of pg_id, the values of pg_id can be calculated from a group of { t_id, f_id, (SFN_id mod (Wmax/10)), and the values of { t_id, f_id, (SFN_id mod (Wmax/10)) can be calculated from the values of one RA-RNTI instead. One possible design is: a is 1, b is 1+a t_id, c is 1+a t_id+b f_id, d is 1+a t_id+b f_id+c (sfn_id mod (Wmax/10)), wherein Wmax is the maximum size of the largest possible random access response window of the user, for example wmax=400, and (sfn_id mod (Wmax/10)) is in the range of 0 to 39; i.e.

a＝1,

b＝max{1+a*t_id}＝M+1,

c＝max{1+a*t_id+b*f_id}＝(M+1)(N+1)，

d＝max{1+a*t_id+b*f_id+c*(SFN_id mod(Wmax/10))}＝(M+1)(N+1)*(Wmax/10)。

For example, m= 9,N =5, wmax=400; the RA-RNTI is calculated as:

RA-RNTI＝1+t_id+10*f_id+60*(SFN_id mod(40))+2400*pg_id。

example eight

In this embodiment, a specific process of generating RA-RNTI by applying the present application in NB-IOT system is described.

When the user reads the configuration information of random access through the downlink channel, after obtaining the corresponding random access time-frequency resource and the corresponding random access lead code (namely the random access lead sequence) grouping, the random access lead code is sent on the selected random access time-frequency resource. After a period of time when the preamble is transmitted, the user needs to search for a possible random access response according to the random access response window size, which is indicated by the RA-RNTI. Unlike conventional calculation in NB-IOT systems, the proposed calculation of RA-RNTI is related to the index of the first time element (e.g., SFN id (index of the first radio frame of the given PRACH), the index of the first radio frame) where a given random access channel (Physical Random Access Channel, PRACH) is located, and the packet index of the random access preamble packets available on the random access channel.

The packet index of the random access preamble packet refers to a packet pg_id of the random access preamble to which the transmitted random access preamble corresponds, where the random access preamble packet is only specific to the random access time-frequency resource selected by the user, and the value range of pg_id is 0 to P, that is, (0 is less than or equal to pg_id is less than p+1). P is a non-negative integer. It should be noted that, since the preamble packet is also a downlink transmission beam selected by the base station user, the preamble packet is bound to the downlink transmission beam, and the preamble packet index may be an index of a downlink transmission beam (Downlink Transmission beam, DL Tx beam), or an index of a synchronization signal block (Synchronization Signal block, SS block), or an index of a physical broadcast signal (PBCH) when calculating the RA-RNTI. In addition, the preamble set may be composed of different preamble root sequences (root sequences) packets, or of a preamble sequence and different orthogonal cover code words (Orthogonal Cover Code, OCC), or of a preamble sequence and different Cyclic Shifts (CS), in addition to the direct grouping of the preamble set. Thus, the preamble grouping index may also be a different root sequence grouping index, an orthogonal cover codeword grouping index, or a different cyclic shift grouping index.

The RA-RNTI is calculated in the following way:

RA-RNTI＝1+a*floor(SFN_id/4)+b*pg_id

wherein floor (x) takes the value of the largest integer smaller than x; a, b are coefficients of floor (SFN_id/4) and pg_id respectively, and the values of a, b are required to meet a condition that RA-RNTI and { floor (SFN_id/4) should be uniquely corresponding to pg_id, and the unique value of RA-RNTI can be calculated from a group of { floor (SFN_id/4) and pg_id, and conversely, the unique value of { floor (SFN_id/4) and pg_id } can be calculated from the value of one RA-RNTI. One possible design is: a has a value of 1 and b has a maximum value of 1+a floor (SFN_id/4), i.e.

a＝1,

b＝max{1+a*floor(SFN_id/4)}＝floor(SFN_id/4)+1,

For example, sfn_id=1024; the RA-RNTI is calculated as:

RA-RNTI＝1+floor(SFN_id/4)+257*pg_id。

example nine

In the above embodiment, the calculation method of RA-RNTI in the present invention is described by setting t_id as the subframe index and f_id as the PRB index. In this embodiment, the setting of the expansion t_id is determined according to a plurality of time unit indexes, for example, a plurality of indexes of subframe indexes (subframe indexes), slot indexes (slot indexes), mini-slot indexes (mini-slot indexes), symbol group indexes (symbol-group indexes), and symbol indexes (symbol indexes); the setting of the expansion f_id is determined according to a plurality of frequency unit indexes, for example, a plurality of indexes of a physical resource block group index (PRB-group index), a physical resource block index (PRB index), a subcarrier index (subcarrier index), and a subcarrier group index (subcarrier group index).

For example, when t_id represents index information of a slot, the index information may be a slot index value, or the index information may be determined according to a slot index and a subframe index. When determining the index information according to the slot index and the subframe index, if the value range of the subframe index t_sf is 0 to m_1 and the value range of the slot index t_slot in one subframe is 0 to m_2, the value of t_id is t_id=t_slot+ (1+m_2) t_sf and the value range of t_id is 0 to m_1+ (1+m_1) m_2, corresponding to other embodiments, the maximum value m=m_1+ (1+m_1) m_2 of t_id. Preferably, the generation principle is that the value of t_id corresponds to the value of { t_sf, t_slot }, i.e. the value of the unique { t_sf, t_slot } can be calculated from one t_id, and vice versa. For example, if m1=9, m2=1, then t_id=t_slot+2×t_sf. For example, when t_id takes a value of 28, t_slot=0 and t_sf=14 can be calculated. When the index combination of other time unit indexes is adopted, the setting of t_id can be inferred in the same way, and assuming that t_id is formed according to the index of time unit 1 (t_1), the index of time unit 2 (t_2), … … and the index of time unit X (t_X), and the corresponding value ranges are 0 to M_1,0 to M_2, … … and 0 to M_X in sequence, the setting of t_id can be as follows

t_id＝a1*t_1+a2*t_2+…+ax*t_X；

Wherein,,

a1＝1；

a2＝1+max{t_1}＝1+M_1；

a3＝1+max{t_1+a2*t_2}＝(1+M_1)(1+M_2)；

…

ax＝1+max(t_1+a2*t_2+…+(ax-1)*t_(X-1))。

similarly, for example, when f_id represents index information of PRBs, the index information may be a subcarrier index, or f_id may be determined according to the subcarrier index and PRB index f_prb. When determining f_id according to the subcarrier index and the PRB index, if the value range of the PRB index is 0 to n_1 and the value range of the subcarrier index f_sc in one PRB is 0 to n_2, the value of f_id is f_id=f_sc+ (1+n_2) f_prb, and the value range is 0 to n_1+ (1+n_1) n_2, corresponding to other embodiments, the maximum value n=n_1+ (1+n_1) n_2 of f_id. Preferably, the generation principle is that the value of f_id corresponds to the value of { f_sc, f_prb }, i.e. the unique value of { f_sc, f_prb } can be calculated from a t_id, and vice versa. For example, if n_1=5 and n_2=11, f_id=f_sc+12×f_prb. For example, when the value of f_id is 42, f_sc=6 and f_prb=3 can be calculated. When index combinations of other frequency unit indexes are adopted, the setting of f_id can be inferred in the same way, and assuming that f_id is composed of a frequency unit 1 (f_1) index, a frequency unit 2 (f_2) index, … … and a frequency unit Y (f_Y) index, the corresponding value ranges are 0 to N_1,0 to N_2, … … and 0 to N_Y in sequence, the setting of f_id can be as follows

f_id＝b1*f_1+b2*f_2+…+by*f_Y；

Wherein,,

b1＝1；

b2＝1+max{f_1}＝1+N_1；

b3＝1+max{f_1+b2*f_2}＝(1+N_1)(1+N_2)；

…

by＝1+max(f_1+b2*f_2+…+(by-1)*f_(Y-1))。

the above is a specific implementation of the information generating method in the present application. The application also provides UE side equipment for generating the information and base station side equipment for generating the information, which can be used for implementing the information generation method. Fig. 11 is a schematic basic structure diagram of a UE-side device for information generation in the present application. As shown in fig. 11, the apparatus includes: a transmitting unit and a calculating unit.

And the sending unit is used for sending the random access preamble to the base station. And the calculating unit is used for calculating the RA-RNTI according to the packet index of the preamble packet where the transmitted random access preamble is located. Wherein, the preamble group is: and pre-corresponding to a random access resource, grouping a plurality of available random access lead codes to obtain the lead code grouping.

Fig. 12 is a schematic diagram of a basic structure of a base station side device for information generation in the present application. As shown in fig. 12, the apparatus includes: a receiving unit and a calculating unit.

And the receiving unit is used for receiving the random access preamble sent by the UE. And the calculating unit is used for calculating the RA-RNTI according to the packet index of the preamble packet where the received random access preamble is located. Wherein, the preamble group is: and pre-corresponding to a random access resource, grouping a plurality of available random access lead codes to obtain the lead code grouping.

From the foregoing, it can be seen that the information generating method and apparatus provided in the present application calculate and generate RA-RNTI by using the time-frequency resource location used by random access and the packet index where the selected preamble is located. When the user searches for possible RAR, the generated RA-RNTI automatically eliminates the random access responses of different preamble groups which use the same time-frequency resource, thereby saving the user searching cost and time delay. And the base station uses different random access wireless network temporary identifiers to distinguish the users selecting different downlink transmission beams in the random access response through the detected random access preamble. Meanwhile, the generation mode is also expanded to eMTC and NBiot systems.

The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather to enable any modification, equivalent replacement, improvement or the like to be made within the spirit and principles of the invention.

Claims

1. An information generation method, comprising:

the User Equipment (UE) sends a random access preamble to a base station;

Wherein, the preamble code group is a group of available random access preamble codes corresponding to random access resources;

the random access resource is determined according to a downlink transmission beam, a physical broadcast signal or a synchronous signal block selected by the UE based on downlink measurement;

the transmitted random access preamble is selected from a preamble packet corresponding to the random access resource and bonded with a downlink transmission beam, a physical broadcast signal, or a synchronization signal block selected by the UE based on a downlink measurement.

2. The method of claim 1, wherein when the random access resource is determined according to a downlink transmission beam selected by the UE based on downlink measurements, if different preamble packets are bound one-to-one with different downlink transmission beams, the preamble packet index is a beam index of the selected downlink transmission beam.

3. The method of claim 1, wherein the preamble packet is determined from a preamble root sequence packet to which a preamble root sequence used by an available random access preamble belongs, wherein random access preambles determined using the same set of preamble root sequences belong to the same preamble packet;

4. The method of claim 1, wherein the preamble group is determined from a group of orthogonal cover codewords to which orthogonal cover codewords used for the available random access preambles belong, wherein random access preambles determined using the same group of orthogonal cover codewords belong to the same preamble group;

5. The method of claim 1, wherein the preamble packet is determined from a cyclic shift packet to which a cyclic shift value used by an available random access preamble belongs, wherein random access preambles determined using the same set of cyclic shift values belong to the same preamble packet;

6. The method of claim 1, wherein the preamble packet is determined from random access preambles, wherein each random access preamble is a preamble packet;

The group index of the preamble group is a random access preamble index.

7. The method of claim 1, wherein calculating the RA-RNTI based on the packet index of the preamble packet and the resource location of the random access resource carrying the random access preamble comprises:

8. The method of claim 7, wherein t_id is set to 0 when calculating the RA-RNTI when there is no time domain distinction between different random access resources;

and/or the number of the groups of groups,

9. The method of claim 1, wherein calculating the RA-RNTI based on the packet index of the preamble packet and the resource location of the random access resource carrying the random access preamble comprises:

Calculating an RA-RNTI according to an index sfn_id of a first time unit in which the random access resource is located, an index information t_id of a first second time unit in which the random access resource is located, an index information f_id of a first frequency domain unit in which the random access resource is located, and a packet index pg_id of the preamble packet, wherein RA-rnti=1+a×t_id+b×f_id+c (sfn_idmod (Wmax/10))+d×pg_id; wherein a, b, c and d are respectively preset weighting coefficients corresponding to t_id, f_id, (SFN_idmod (Wmax/10)) and pg_id, wmax is the maximum window length of a possible random access response window of a user.

10. The method according to claim 7, 8 or 9, characterized in that a = 1, b = max {1+a t_id } = m+1, c = max {1+a t_id+b f_id } = (max { t_id } +1) (max { f_id } +1); and M is the maximum value of the index information t_id.

11. The method according to claim 7, 8 or 9, characterized in that the index information t_id of the time unit/second time unit is: and the index value of the time unit/the second time unit, or the t_id is determined according to the index values in a plurality of time units where the random access resource is located.

12. The method of claim 7, wherein the index information f_id of the frequency unit is: and the index value of the frequency unit, or the f_id is determined according to the index values of the random access resource in a plurality of frequency units.

13. The method according to claim 11, wherein the index value of the time unit/second time unit is: subframe index, slot index, minislot index, symbol group index, or symbol index; and/or the number of the groups of groups,

the index values within the plurality of time units include: subframe index, slot index, minislot index, symbol group index, and a plurality of indexes among symbol indexes.

14. The method of claim 9, wherein the first time unit is a radio frame.

15. The method according to claim 7 or 12, wherein the index of the frequency unit is: a physical resource block, PRB, group index, PRB index, subcarrier index, or subcarrier group index; and/or the number of the groups of groups,

16. The method according to any of claims 1 to 6, wherein the way of calculating the RA-RNTI from the packet index of the preamble packet and the resource location of the random access resource carrying the random access preamble comprises:

17. The method of claim 16, wherein a = 1, b = max {1+a floor (sfn_id/4) } = floor (sfn_id/4) +1.

18. An information generation method, comprising:

the base station receives a random access preamble sent by User Equipment (UE);

19. An information generating apparatus, characterized by comprising: a transmitting unit and a calculating unit;

the calculating unit is used for calculating RA-RNTI according to the group index of the preamble group where the transmitted random access preamble is located; wherein, the preamble code group is a group of available random access preamble codes corresponding to random access resources; the random access resource is determined according to a downlink transmission beam, a physical broadcast signal or a synchronous signal block selected by the UE based on downlink measurement; the transmitted random access preamble is selected from a preamble packet corresponding to the random access resource and bonded with a downlink transmission beam, a physical broadcast signal, or a synchronization signal block selected by the UE based on a downlink measurement.

20. An information generating apparatus, characterized by comprising: a receiving unit and a calculating unit;

Wherein, the preamble code group is a group of available random access preamble codes corresponding to random access resources; the random access resource is determined according to a downlink transmission beam, a physical broadcast signal or a synchronous signal block selected by the UE based on downlink measurement; the transmitted random access preamble is selected from a preamble packet corresponding to the random access resource and bonded with a downlink transmission beam, a physical broadcast signal, or a synchronization signal block selected by the UE based on a downlink measurement.