CN101742684B - Metho, base station and terminal for determining random access radio network temporary identity (RA-RNTI) - Google Patents
Metho, base station and terminal for determining random access radio network temporary identity (RA-RNTI) Download PDFInfo
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Abstract
The invention provides a method, a base station and a terminal for determining a random access radio network temporary identity (RA-RNTI), wherein the method comprises the following steps of: the terminal determines an RA-RNTI value which corresponds to a PRACH (Physical Random Access Channel) used by the terminal according to the mapping relation between predetermined physical layer and media access control layer and the number of the physical random access channel (PRACH) and the value of the RA-RNTI, and receives random access response taking the RA-RNTI value as an identity in a random access response window which corresponds to the PRACH used by the terminal. The invention does not need to additionally number the PRACH and store the corresponding relation between an additional number and the PRACH in the base station and the terminal, thereby reducing the storage and processing load of the base station and the terminal.
Description
Technical Field
The present invention relates to mobile communication technologies, and in particular, to a method, a base station, and a terminal for determining a temporary identifier of a random access wireless network.
Background
A random access radio network temporary identity (RA-RNTI) is a scheduling identity used to identify a random access response carried on a Packet Data Control Channel (PDCCH). A concept of a random access response window exists in a Long Term Evolution (LTE) system, one random access response window corresponds to one Physical Random Access Channel (PRACH) resource, random access responses sent in the random access response window are all identified by one RA-RNTI, but a situation that a plurality of random access response windows are overlapped usually occurs, and in order to distinguish PRACH which may cause confusion in each random access response window, different RA-RNTIs need to be allocated to random access responses corresponding to each PRACH.
In the prior art, a method for determining an RA-RNTI is to predefine N continuous values as the RA-RNTI in a value of a standard Radio Network Temporary Identifier (RNTI), wherein for Frequency Division Duplex (FDD), N is 10, and 0 to 9 are predefined as the RA-RNTI; for Time Division Duplex (TDD), N is taken to be 60, and 0 to 59 are predefined as RA-RNTI. Then, according to the mapping relation of RA-RNTI (t _ id +10 Xf _ id), distributing RA-RNTI for each corresponding PRACH in a random access response window, wherein the distributed RA-RNTI corresponds to the PRACH one by one; wherein, t _ id is a number according to the time domain resource occupied by the PRACH, and f _ id is a number according to the frequency domain resource occupied by the PRACH. The method comprises the steps that a base station and a terminal store the corresponding relation between the resource position occupied by the PRACH and the PRACH number and the mapping relation between the PRACH number and RA-RNTI, after the base station receives the PRACH used by the terminal, the t _ id and the f _ id of the PRACH used by the terminal are determined, then the RA-RNTI corresponding to the PRACH is determined according to the corresponding relation and the mapping relation, and then random access response identified by the determined RA-RNTI is sent to the terminal; correspondingly, after the terminal sends the PRACH used by the terminal, the t _ id and the f _ id of the PRACH are determined, then the RA-RNTI corresponding to the PRACH is determined according to the stored corresponding relation and the mapping relation, and the random access response identified by the determined RA-RNTI is received.
Since there are many situations of numbering the PRACH in the prior art, for example, there are already physical layer (PHY) numbering the PRACH, Media Access Control (MAC) layer numbering the PRACH, and the like, the base station and the terminal need to store the corresponding relationships between the PRACH and the numbering of the various situations, and the method for allocating the RA-RNTI provided in the prior art also needs to additionally number the PRACH according to the time domain resource and the frequency domain resource occupied by the PRACH, and additionally stores the corresponding relationship between the PRACH and the numbering, which obviously increases the storage and processing burden of the base station and the terminal.
Disclosure of Invention
In view of the above, the present invention provides a method, a base station and a terminal for determining an RA-RNTI, so as to reduce storage and processing burdens of the base station and the terminal.
A method of determining an RA-RNTI, the method comprising:
the terminal determines an RA-RNTI value corresponding to a PRACH used by the terminal according to a mapping relation between the number of the PRACH and the RA-RNTI value by a preset physical PHY layer or a media access control MAC layer, and receives a random access response taking the RA-RNTI value as an identifier in a random access response window corresponding to the PRACH used by the terminal;
and after receiving the PRACH used by the terminal, the base station determines the RA-RNTI corresponding to the PRACH used by the terminal according to the mapping relation between the number of the PRACH and the value of the RA-RNTI by a preset physical PHY layer or a Media Access Control (MAC) layer, and identifies the random access response corresponding to the PRACH by the determined RA-RNTI.
A base station, the base station comprising: the device comprises a mapping relation storage unit, an identification determining unit and a response sending unit;
the mapping relation storage unit is used for storing the mapping relation between the PRACH number and the RA-RNTI value by the PHY layer or the MAC layer;
the identifier determining unit is used for determining RA-RNTI corresponding to PRACH used by the terminal according to the mapping relation;
and the response sending unit is used for identifying the random access response corresponding to the PRACH by the RA-RNTI determined by the identification determining unit and sending the random access response.
According to the technical scheme, the invention can determine the RA-RNTI of the random access response corresponding to each PRACH by directly utilizing the PRACH number of the PHY layer or the MAC layer according to the preset mapping relation between the PRACH number and the RA-RNTI value of the PHY layer or the MAC layer, does not need to additionally number the PRACH according to the time domain resource and the frequency domain resource occupied by the PRACH, does not need to store the corresponding relation between the additional number and the PRACH, and obviously reduces the storage and processing burden of a base station and a terminal.
Drawings
Fig. 1 is a schematic diagram of numbering of each PRACH by a PHY layer according to an embodiment of the present invention;
fig. 2 is a schematic diagram illustrating RA-RNTI allocated to each PRACH number by a PHY layer according to an embodiment of the present invention;
fig. 3 is a schematic diagram of numbering of each PRACH by the MAC layer according to an embodiment of the present invention;
fig. 4 is a schematic diagram illustrating RA-RNTI allocated to each PRACH number by using an MAC layer according to an embodiment of the present invention;
fig. 5 is a structural diagram of a base station according to an embodiment of the present invention;
fig. 6 is a diagram of a terminal structure according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in detail with reference to the accompanying drawings and specific embodiments.
The method provided by the invention mainly comprises the following steps: and the terminal determines an RA-RNTI value corresponding to the PRACH used by the terminal according to the mapping relation between the number of the PRACH by the PHY layer or the MAC layer and the RA-RNTI value, and receives a random access response taking the RA-RNTI value as an identifier in a random access response window corresponding to the PRACH used by the terminal.
Correspondingly, at a network end, after receiving the PRACH used by the terminal, a base station determines the RA-RNTI corresponding to the PRACH according to the mapping relation between the number of the PRACH and the value of the RA-RNTI by a preset PHY layer or MAC layer, and identifies the random access response corresponding to the PRACH by the determined RA-RNTI.
The invention can reserve N RNTIs as RA-RNTI, and the N RNTIs can only be used as RA-RNTI and can not be used for other purposes. That is, the invention can preset N RA-RNTI values, and the RA-RNTI determined by the base station is one of the preset N RA-RNTI values. That is to say, various possible RA-RNTI values can be obtained according to the position of each PRACH and the mapping relationship, and these values are used as preset N RA-RNTI values, where N may be determined according to the number of PRACH configured in one radio frame, for example, N may be the maximum number of PRACH included in one radio frame.
In order to save signaling overhead, in the method for determining the RA-RNTI provided by the invention, RA-RNTIs with different values are still adopted to correspond to different PRACHs, and the corresponding relation between the PRACHs and the values of the RA-RNTIs is respectively calculated or stored in a base station and a terminal, rather than the mapping relation is carried in signaling explicitly.
Because the values of the RA-RNTIs correspond to the PRACH one by one, if the PRACH resource allocation of one cell is fixed and unchangeable, the number of the corresponding RA-RNTIs is also fixed and unchangeable. For example, if 3 PRACH channels are configured in one radio frame, 3 RNTIs may be preset as RA-RNTIs. However, considering the dynamic change of the load, the PRACH resource configuration in a cell may also change dynamically, and in order to match the change of the PRACH resource configuration, the preset RA-RNTI number N may be set to the maximum PRACH number included in one radio frame. For example, because 10 PRACH channels are included in one radio frame in FDD at most and 6 PRACH channels are included in one radio frame in TDD at most, 10 RNTIs can be preset as RA-RNTIs for FDD, that is, values of 10 RA-RNTIs are preset, and 6 RNTIs can be preset as RA-RNTIs for TDD; for convenience of configuration, 10 RNTIs may be preset as RA-RNTIs without specifically distinguishing FDD and TDD. Of course, the maximum number of PRACH included in more than one radio frame may also be preset.
Normally, the preset N values of the RA-RNTI are continuous N values, if the initial value is the RA-RNTIintiThen, the mapping relationship between the PRACH number and the RA-RNTI value by the PHY layer or the MAC layer may be: RA-RNTI ═ RA-RNTIinit+ index. The index is the number of the PRACH by the PHY layer or the MAC layer, and the number is unique to each PRACH.
For convenience of understanding, the PRACH resource configuration situation in the cell is first briefly explained. Table 1 shows all cases of PRACH resource configuration for TDD case.
TABLE 1
In the above table, parameters
Uniquely identifying a PRACH, of which fRAThe index of the frequency domain where the PRACH is located;a repetition status of the PRACH is indicated,taking 0 to indicate that PRACH repetition occurs in all radio frames,
taking 1 to indicate that PRACH repetition occurs in all even radio frames,
taking 2 to represent that PRACH repeatedly appears in all odd radio frames;
indicating whether the PRACH is located in the first half frame or the second half frame,taking 0 to indicate that the PRACH is located in the first half frame,
1 is taken to represent that PRACH is positioned in the second half frame;
an uplink subframe indicating the start of a PRACH,characterize PRACH starting from the uplink pilot time slot (UpPTS).
The above method is described below with reference to specific examples.
Firstly, the condition that the PHY layer is used for allocating RA-RNTI to the PRACH number is introduced, in the LTE standard, 10 RNTIs are preset as RA-RNTI, and the RA-RNTI is an initial valueinitIs 0. Assuming that PRACH resource configuration 57 of a cell and configuration status of an uplink/downlink subframe is configuration 0, as shown in table 1, there are 6 PRACH resources in a radio frame, and the following are in order: (0,0,0,*),(0,0,1,*),(1,0,0,*),(1,0,1,*),(2,0,0,*),(2,0,1,*). The radio frame configuration status, the PRACH configuration status, and the number of each PRACH by the PHY layer are shown in fig. 1.
According to RA-RNTI ═ RA-RNTIinitIn the mapping relation of + index, the number of the PHY layer pair (0, 0, 0,) is 0, the corresponding RA-RNTI thereof is 0, the number of the PHY layer pair (0, 0, 1,) is 1, the corresponding RA-RNTI thereof is 1, the number of the PHY layer pair (1, 0, 0,) is 2, the corresponding RA-RNTI thereof is 2, the number of the PHY layer pair (1, 0, 1,) is 3, the corresponding RA-RNTI thereof is 3, the number of the PHY layer pair (2, 0, 0,) is 4, the corresponding RA-RNTI thereof is 4, the number of the PHY layer pair (2, 0, 1,) is 5, and the corresponding RA-RNTI thereof is 5. The allocation status of RA-RNTI is shown in fig. 2.
In the prior art, the corresponding relation between each PRACH position and each PRACH number by the PHY layer is stored by the base station and the terminal, so the base station can determine the number of each PRACH by the PHY layer according to the PRACH used by each terminal, obtain the RA-RNTI value corresponding to the PRACH used by each terminal according to the mapping relation, identify the random access response corresponding to the PRACH by using the obtained RA-RNTI value and send the random access response in the random access window corresponding to the PRACH; correspondingly, the terminal can determine the number of each PRACH by the PHY layer according to the PRACH used by the terminal, obtain the RA-RNTI value corresponding to the PRACH used by the terminal according to the mapping relation, and receive the random access response identified by the RA-RNTI value in the random access response window corresponding to the PRACH used by the terminal.
In the following, the case that RA-RNTI is allocated to the PRACH number by the MAC layer is described, 10 RNTIs are still preset as RA-RNTIs, and the initial value is 0, that is, the value of the preset RA-RNTI is 0 to 9. The same configuration is still adopted as in the previous embodiment, that is, the PRACH resource configuration of the cell is configuration 57, the configuration status of the uplink/downlink subframe is configuration 0, and the numbering status of the MAC layer for each PRACH is shown in fig. 3.
According to RA-RNTI ═ RA-RNTIinitIn the mapping relation of + index, the number of the MAC layer pair (0, 0, 0,) is 0, the corresponding RA-RNTI is 0, the number of the MAC layer pair (1, 0, 0,) is 1, the corresponding RA-RNTI is 1, the number of the MAC layer pair (2, 0, 0,) is 2, the corresponding RA-RNTI is 2, the number of the MAC layer pair (0, 0, 1,number of 3, corresponding RA-RNTI takes the value of 3, number of MAC layer pair (1, 0, 1,) takes the value of 4, corresponding RA-RNTI takes the value of 4, number of MAC layer pair (2, 0, 1,) takes the value of 5, corresponding RA-RNTI takes the value of 5. The allocation status of RA-RNTI is shown in fig. 4.
Similarly, the base station and the terminal store the corresponding relation between each PRACH position and each PRACH number by the MAC layer, therefore, the base station can determine the number of each PRACH by the MAC layer according to the PRACH used by each terminal, obtain the RA-RNTI value corresponding to the PRACH used by each terminal according to the mapping relation, identify the random access response corresponding to the PRACH by using the obtained RA-RNTI value, and send the random access response in the random access window corresponding to the PRACH; correspondingly, the terminal can determine the number of each PRACH by the MAC layer according to the PRACH used by the terminal, obtain the RA-RNTI value corresponding to the PRACH used by the terminal according to the mapping relation, and receive the random access response identified by the RA-RNTI value in the random access response window corresponding to the PRACH used by the terminal.
Other numbering forms of the PHY layer and the MAC layer to the PRACH are also applicable to the present invention, and are not described herein again.
The above is a detailed description of the method provided by the present invention, and the following is a description of the base station and the terminal provided by the present invention, respectively.
Fig. 5 is a structural diagram of a base station according to an embodiment of the present invention, and as shown in fig. 5, the base station may include: a mapping relation storage unit 500, an identification determination unit 501 and a response transmission unit 502.
And a mapping relation storage unit 500, configured to store a mapping relation between the number of the PRACH and the RA-RNTI value by the PHY layer or the MAC layer.
An identifier determining unit 501, configured to determine, according to the mapping relationship stored in the mapping relationship storage unit 500, an RA-RNTI corresponding to the PRACH used by the terminal.
A response sending unit 502, configured to identify a random access response corresponding to the PRACH with the RA-RNTI determined by the identity determining unit 501, and send the random access response.
The identifier determining unit 501 may use the sum of the number of each PRACH received by the PHY layer or the MAC layer and a preset initial value of the RA-RNTI as an RA-RNTI value allocated to a random access response window corresponding to each PRACH within a preset range of N RA-RNTIs; n may be the maximum PRACH number included in one radio frame.
In addition, the base station may further include: a correspondence relation storage unit 503 and a number determination unit 504.
A correspondence storing unit 503 is configured to store a correspondence between a PRACH position and a number of the PRACH by the PHY layer or the MAC layer.
A number determination unit 504, configured to determine, according to the correspondence, a number of a PRACH used by the PHY layer or the MAC layer for the terminal, and provide the number to the identifier determination unit 501.
The correspondence relation storage unit 503 and the number determination unit 504 described above are units in which a base station already exists in the related art.
Fig. 6 is a structure diagram of a terminal according to an embodiment of the present invention, and as shown in fig. 6, the terminal may include: a mapping relation storage unit 601, an identification determination unit 602, and a response reception unit 603.
And a mapping relation storage unit 601, configured to store a mapping relation between a PRACH number and an RA-RNTI value by the PHY layer or the MAC layer.
An identifier determining unit 602, configured to determine an RA-RNTI corresponding to the PRACH used by the terminal according to a mapping relationship between a preset number of the PRACH by the PHY layer or the MAC layer and an RA-RNTI value.
A response receiving unit 603, configured to receive a random access response identified by the RA-RNTI determined by the identifier determining unit 602 in a random access response window corresponding to the PRACH used by the terminal.
The identifier determining unit 602 may use the sum of the number of the PRACH used by the PRY layer or the MAC layer for the terminal and a preset initial value of the RA-RNTI as the value of the RA-RNTI corresponding to the PRACH used by the identity determining unit.
In addition, the terminal may further include: a correspondence relation storage unit 604 and a number determination unit 605.
A correspondence storing unit 604, configured to store a correspondence between a position of the PRACH and a number of the PRACH by the PHY layer or the MAC layer.
A number determination unit 605, configured to determine the number of each PRACH transmitted by the PHY layer or the MAC layer to the terminal according to the correspondence, and provide the number to the identifier determination unit 602.
It can be seen from the above description that, according to the mapping relationship between the PRACH number and RA-RNTI value of the preset PHY layer or MAC layer to the random access channel, the present invention directly utilizes the PRACH number of the PHY layer or MAC layer to determine the RA-RNTI of the random access response corresponding to each PRACH, and does not need to additionally number the PRACH according to the time domain resource and the frequency domain resource occupied by the PRACH, or store the corresponding relationship between the additional number and the PRACH, which obviously reduces the storage and processing burden of the base station and the terminal.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (8)
1. A method of determining a random access radio network temporary identity, RA-RNTI, the method comprising:
the terminal determines an RA-RNTI value corresponding to a PRACH used by the terminal according to a mapping relation between the number of the PRACH and the RA-RNTI value by a preset physical PHY layer or a media access control MAC layer, and receives a random access response taking the RA-RNTI value as an identifier in a random access response window corresponding to the PRACH used by the terminal;
and after receiving the PRACH used by the terminal, the base station determines the RA-RNTI corresponding to the PRACH used by the terminal according to the mapping relation between the number of the PRACH and the value of the RA-RNTI by a preset physical PHY layer or a Media Access Control (MAC) layer, and identifies the random access response corresponding to the PRACH by the determined RA-RNTI.
2. The method of claim 1, wherein prior to determining the RA-RNTI value, further comprising: and the terminal determines the number of each PRACH used by the PHY layer or the MAC layer for the terminal according to the corresponding relation between the position of the PRACH and the number of the PRACH used by the PHY layer or the MAC layer.
3. The method according to claim 1 or 2, wherein the mapping relationship is: and the value of the RA-RNTI is equal to the sum of the preset initial value of the RA-RNTI and the PRACH number of the PHY layer or the MAC layer.
4. The method according to claim 1 or 2, wherein N RA-RNTI values are preset, and the determined RA-RNTI is one of the preset N RA-RNTI values; wherein, N is the maximum PRACH number included in one radio frame.
5. The method of claim 4, wherein N is 10 for frequency division duplex, FDD; or,
for time division duplex TDD, the N is 6 or 10.
6. A base station, comprising: the device comprises a mapping relation storage unit, an identification determining unit and a response sending unit;
the mapping relation storage unit is used for storing the mapping relation between the PRACH number and the RA-RNTI value by the PHY layer or the MAC layer;
the identifier determining unit is used for determining RA-RNTI corresponding to PRACH used by the terminal according to the mapping relation;
and the response sending unit is used for identifying the random access response corresponding to the PRACH by the RA-RNTI determined by the identification determining unit and sending the random access response.
7. The base station of claim 6, wherein the identifier determining unit takes the sum of the number of each PRACH received by the PHY layer or the MAC layer and a preset initial value of the RA-RNTI as the RA-RNTI value allocated to the random access response window corresponding to each PRACH within a preset range of N RA-RNTI values; wherein, N is the maximum PRACH number included in one radio frame.
8. The base station according to claim 6 or 7, characterized in that the base station further comprises: a corresponding relation storage unit and a number determination unit;
the corresponding relation storage unit is used for storing the corresponding relation between the position of the PRACH and the number of the PRACH by the PHY layer or the MAC layer;
and the number determining unit is configured to determine, according to the correspondence, a number of the PRACH used by the PHY layer or the MAC layer for the terminal, and provide the number to the identifier determining unit.
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| CN106941730A (en) * | 2016-01-05 | 2017-07-11 | 中兴通讯股份有限公司 | The control method and device of Stochastic accessing |
| CN106954278B (en) * | 2016-01-07 | 2021-09-28 | 中兴通讯股份有限公司 | Method for determining random access wireless network temporary identifier, user equipment and base station |
| WO2018227544A1 (en) * | 2017-06-16 | 2018-12-20 | Oppo广东移动通信有限公司 | Random access signal transmission method and related product |
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