CN101969697A - Method and system for accessing uplink of user equipment to base station randomly, base station and user equipment - Google Patents

Abstract

The embodiment of the invention relates to a method and a system for accessing an uplink of user equipment (UE) to a base station randomly, the base station and the user equipment. In the embodiment of the invention, the base station assigns uplink carrier identification information to the UE, so that the UE can be prevented from sending random access codes by selecting uplink carriers randomly and the uplink carrier can also be prevented from being limited to send the random access codes by corresponding to downlink carriers, so the method and the system are favorable for accessing load balance; the same random access codes can be configured on the same subframes of different uplink carriers to be sent, so the same random access codes and the same physical random access channel indexes can be distributed to different UE (corresponding to different uplink carriers); therefore, the utilization rate of the random access codes is improved greatly.

Description

Method and system for uplink random access of user equipment to base station, base station and user equipment

technical field

The present invention relates to the field of communication technology, in particular to a method and system for uplink random access of user equipment to a base station, a base station and user equipment.

Background technique

When the standardization of the Long Term Evolution (LTE for short) system is nearly completed, the Long Term Evolution-Advanced (LTE-A for short) system starts to start. LTE-A must be a smooth evolution of LTE, maintain backward compatibility with LTE R8 version, support higher bandwidth in terms of LTE-A system spectrum, and support continuous or discontinuous use of LTE system spectrum. Representative key technologies for the evolution of LTE-A systems include carrier aggregation and multi-antenna technology enhancement.

In the LTE system, after the downlink (from the base station to the UE) of the user equipment (referred to as UE) is synchronized, it receives the broadcast master information block (Master Information Block, referred to as MIB) message of the downlink carrier to know the bandwidth (DL-Bandwidth) occupied by the downlink carrier. ), the minimum DL-Bandwidth is 6RB, and the maximum is 100RB, corresponding to 1.4MHz and 20MHz bandwidth respectively; after the downlink synchronization of the UE, in order to transmit uplink data, the UE needs to initiate an uplink random access process for uplink (by UE to base station) synchronization, the uplink random access procedure is to send a random access code (preamble) on the uplink random access resource. In addition, in the System Information Block (SIB) 1 message of each downlink carrier, the uplink frequency band index value (FrequencyBandIndicator) is indicated. In the frequency division duplex (FDD) mode of the existing LTE system, the uplink and The downlink is the same frequency band; in the SIB2 message of each downlink carrier, in addition to indicating the size of the uplink bandwidth (UL-Bandwidth), it also indicates the frequency information of the uplink carrier (UL-EARFCN), which can be calculated according to the above information The center frequency of the uplink carrier is obtained, but the LTE system defaults to a fixed configuration determined by the TX-RX frequency interval between the uplink center frequency and the downlink center frequency. After knowing the downlink center frequency and frequency range, the uplink center frequency can be obtained, so that The frequency information necessary for UE uplink access can be obtained.

In the existing LTE system, only one carrier is involved in the uplink/downlink, and the process of sending the random access code on the uplink random access resource in the uplink random access process is only performed on one uplink carrier corresponding to the downlink carrier.

However, in the LTE-A system, due to the existence of carrier aggregation technology, both the uplink carrier and the downlink carrier may be the aggregation of multiple carriers, and there is a scenario where there are multiple uplink carriers corresponding to one downlink carrier. In this scenario, A downlink carrier may carry information of multiple uplink carriers. According to the uplink random access process in the existing LTE system, after the UE receives the random access code issued by the base station (eNB) and the physical random access channel index (PRACH Mask Index) corresponding to the uplink random access resource, It is possible to clearly send the random access code in the uplink random access resource corresponding to the physical random access channel index (that is, one or some subframes of the information frame), but it is not clear in which uplink the UE will send the random access code sent on the carrier. In addition, in a multi-carrier LTE-A system, in the scenario where one downlink carrier corresponds to one uplink carrier, if the uplink random access process is still performed on the uplink carrier corresponding to the downlink carrier, it will be unfavorable for the access load. balance.

Contents of the invention

The purpose of the embodiments of the present invention is to provide a method and system for a user equipment to randomly access a base station in uplink, a base station and a user equipment, so as to specify the uplink carrier used in the uplink random access process, thereby improving the randomness of the uplink random access process. The utilization rate of the access code can be used to balance the load of the uplink access.

An embodiment of the present invention provides a method for a user equipment to randomly access a base station uplink, including:

Obtain the uplink carrier identification information issued by the base station, as well as the random access code and physical random access channel index;

sending the random access code to the base station on the uplink carrier corresponding to the uplink carrier identification information and on the uplink random access resource corresponding to the physical random access channel index;

receiving a random access response message sent by the base station after detecting the random access code, and completing uplink random access from the user equipment to the base station.

The embodiment of the present invention also provides a method for uplink random access of a user equipment to a base station, including:

Send the uplink carrier identification information, as well as the random access code and physical random access channel index to the user equipment;

receiving the random access code sent by the user equipment on the uplink carrier corresponding to the uplink carrier identification information and on the uplink random access resource corresponding to the physical random access channel index;

After the random access code is detected, a random access response message is sent to the user equipment to complete uplink random access from the user equipment to the base station.

The embodiment of the present invention also provides a user equipment, including:

An acquisition module, configured to acquire uplink carrier identification information issued by the base station, as well as a random access code and a physical random access channel index;

a sending module, configured to send the random access code to the base station on the uplink carrier corresponding to the uplink carrier identification information and on the uplink random access resource corresponding to the physical random access channel index;

The receiving module is configured to receive a random access response message sent by the base station after detecting the random access code, and complete uplink random access from the user equipment to the base station.

The embodiment of the present invention also provides a base station, including:

The first sending module is configured to send uplink carrier identification information, a random access code and a physical random access channel index to the user equipment;

a receiving module, configured to receive the random access code sent by the user equipment on the uplink carrier corresponding to the uplink carrier identification information and on the uplink random access resource corresponding to the physical random access channel index;

a detection module, configured to detect the random access code received by the receiving module;

The second sending module is configured to send a random access response message to the user equipment after the detection module detects the random access code, so as to complete the uplink random access from the user equipment to the base station.

The embodiment of the present invention also provides a system for uplink random access of a user equipment to a base station, including: a base station and a user equipment,

The base station sends uplink carrier identification information, as well as a random access code and a physical random access channel index to the user equipment; receives the user equipment on the uplink carrier corresponding to the uplink carrier identification information, and the The random access code sent on the uplink random access resource corresponding to the physical random access channel index; after detecting the random access code, sending a random access response message to the user equipment to complete the user equipment Uplink random access to the base station;

The user equipment obtains the uplink carrier identification information issued by the base station, as well as the random access code and the physical random access channel index; on the uplink carrier corresponding to the uplink carrier identification information, in the physical random access Send the random access code to the base station on the uplink random access resource corresponding to the channel index; receive a random access response message sent by the base station after detecting the random access code, and complete the user equipment to the Uplink random access of the base station.

It can be seen from the above technical solutions that the method and system for uplink random access of a user equipment to a base station, the base station and the user equipment according to the embodiments of the present invention can avoid the UE from randomly selecting an uplink carrier to transmit by using the uplink carrier identification information assigned by the base station to the UE The random access code can also avoid restricting an uplink carrier to correspond to the downlink carrier to send the random access code, which is conducive to access load balancing; and because the same random access code can be configured on the same Subframe transmission, so that the same random access code and the same physical random access channel index can be allocated to different UEs (corresponding to different uplink carriers) at the same time, thereby greatly improving the utilization rate of the random access code.

Description of drawings

FIG. 1 is a schematic flowchart of a first embodiment of a method for uplink random access of a user equipment to a base station according to the present invention;

FIG. 2 is a schematic flowchart of a second embodiment of a method for uplink random access of a user equipment to a base station according to the present invention;

FIG. 3 is a schematic flowchart of a third embodiment of a method for uplink random access of a user equipment to a base station according to the present invention;

FIG. 4 is a schematic flowchart of a fourth embodiment of a method for uplink random access of a user equipment to a base station according to the present invention;

FIG. 5 is a schematic structural diagram of a user equipment according to an embodiment of the present invention;

FIG. 6 is a schematic structural diagram of a base station according to an embodiment of the present invention;

FIG. 7 is a schematic structural diagram of a system for uplink random access of a user equipment to a base station according to an embodiment of the present invention.

Detailed ways

The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

The uplink random access process mentioned in the embodiment of the present invention can be triggered by the following five events to trigger the UE to initiate the uplink random access process:

① Initial access from the Radio Resource Control (RRC) initialization (RRC_IDLE) state;

②Initial access after wireless link failure;

③ The random access process required by the UE during the handover process from the source base station to the destination base station;

④ In the RRC connection (RRC_CONNECTED) state, when the downlink data arrives at the UE, the uplink is still in an unsynchronized state, and the required random access process;

⑤ In the RRC_CONNECTED state, the uplink data arrives, but the uplink is in an asynchronous state, which requires a random access process.

According to the uplink random access resources in the uplink random access process initiated by the UE and whether the random access code is a public contention resource or a dedicated resource, the random access process is divided into two forms: the conflict-based random access process, that is, the uplink Random access resources and random access codes are public contention resources, which are applied to all the above five events; and non-conflict-based random access procedures, that is, uplink random access resources and random access codes are dedicated resources, which are applied to Event ③ and Event ④ mentioned above.

The embodiment of the present invention is mainly aimed at the process of specifying the uplink carrier for uplink random access in the case of multiple uplink carriers in the LTE-A system in the non-conflict-based random access scenario, so that multiple uplink carriers In the LTE-A system, the UE can be made to know explicitly which uplink carrier to perform the uplink random access procedure on.

FIG. 1 is a schematic flowchart of a first embodiment of a method for uplink random access of a user equipment to a base station according to the present invention. As shown in Figure 1, it includes the following steps:

Step 101. Obtain uplink carrier identification information issued by the base station, as well as random access code and physical random access channel index;

Based on the LTE-A system with multiple uplink carriers according to the embodiment of the present invention, and in the non-collision-based random access scenario, the UE also needs to obtain the dedicated random access code and the physical random access channel index while obtaining the Uplink carrier identification information to indicate on which uplink carrier the UE sends the dedicated random access code; wherein, the uplink carrier identification information and the random access code and physical random access channel index may be in the same message or not in the same message sent to the UE in the message;

Step 102, sending a random access code to the base station on the uplink carrier corresponding to the uplink carrier identification information and on the uplink random access resource corresponding to the physical random access channel index;

Step 103: Receive a random access response message sent by the base station after detecting the random access code, and complete uplink random access from the UE to the base station.

The physical random access channel index (PRACH Mask Index) indicates which or which subframes of the information frame the dedicated random access code is restricted to in the uplink random access resource, which is the PRACH resource in this embodiment. For the FDD mode, there is only one PRACH resource in each subframe, but not every subframe is configured with PRACH resources, and which subframes are configured with PRACH resources depends on the configuration of the LTE-A system. After such limitation, the same random access code can be assigned to different UEs to send at different times, so as to improve the utilization rate of the random access code. The definition of the physical random access channel index can be shown in the following table 1. For example, if the configured physical random access channel index is 1, it means that the UE will send a dedicated random access code in the PRACH resource in subframe 0 of the information frame. random access process.

Table 1: Physical Random Access Channel Index Values

The method for uplink random access of a user equipment to a base station provided in this embodiment can prevent the UE from randomly selecting an uplink carrier to send a random access code by using the uplink carrier identification information assigned by the base station to the UE, and can also avoid limiting an uplink carrier. Corresponding to the downlink carrier to send the random access code, which is beneficial to access load balancing; and because the same random access code can be configured to be sent on the same subframe of different uplink carriers, the same random access code can be sent The code and the same physical random access channel index are allocated to different UEs (corresponding to different uplink carriers) at the same time, thereby greatly improving the utilization rate of the random access code.

FIG. 2 is a schematic flowchart of a second embodiment of a method for uplink random access of a user equipment to a base station according to the present invention. This embodiment mainly aims at the above event ④, the eNB triggers the uplink random access process initiated by the UE in the physical downlink control channel (Physical Downlink Control Channel, PDCCH for short) of the physical layer. As shown in Figure 2, it includes the following steps:

Step 201, the UE receives an information frame in the format of 1A Downlink Control Information (DCI) sent by the base station through the PDCCH, and the information frame carries the uplink carrier identification information, as well as the random access code and the physical random access channel index;

Step 202, the UE sends a random access code to the base station on the uplink carrier corresponding to the uplink carrier identification information and on the uplink random access resource corresponding to the physical random access channel index;

Step 203, the UE receives the random access response message sent by the base station after detecting the random access code, and completes the uplink random access from the UE to the base station.

Among them, for the event ④: in the RRC_CONNECTED state, when the UE's downlink data arrives, but the UE's uplink is still in an unsynchronized state, the required uplink random access process is described in detail.

The PDCCH is used to transmit DCI, scheduling information for downlink data transmission, scheduling information for uplink data transmission, and uplink power control commands. According to the different DCI content, the format of the information frame can be divided into the following types: DCI format 0, DCI format 1, DCI format 1A, DCI format 1B, DCI format 1C, DCI format 1D, DCI format 2, DCI format 2A, DCI format 3, DCI format 3A.

Among them, DCI format 0, DCI format 1A, DCI format 3, and DCI format 3A have the same payload bit length. The specific length is the maximum value between DCI format 0 and DCI format 1A, and the reserved bits are supplemented with 0. , and the specific length varies according to the system bandwidth. DCI format 1A is used to send the compressed PDSCH resource allocation information in the case of downlink single codeword, and the information in the uplink random access process initiated by the UE triggered by the eNB in the PDCCH when the downlink data arrives, the latter is more needed than the former The bit length of is small, that is, there are reserved bits.

In FDD mode, DCI format 1A is used to send compressed PDSCH resource allocation information in the case of downlink single codeword. The specific format is as follows:

-Flag for format0/format1A differentiation-1bit;

-Localized/Distributed VRB assignment flag-1bit;

//大小由系统带宽决定；

//The size is determined by the system bandwidth;

-Modulation and coding scheme-5bits;

-HARQ process number-3bits;

-New data indicator-1bit;

-Redundancy version-2bits;

-TPC command for PUCCH-2bits.

The above total bit value is

In FDD mode, DCI format 1A is used to send the information in the uplink random access process initiated by the UE triggered by the eNB in the PDCCH when the downlink data arrives. The specific format is as follows:

-Flag for format0/format1A differentiation-1bit;

-Localized/Distributed VRB assignment flag-1bit is set to '0';

-Preamble Index-6bits;

-PRACH Mask Index-4bits.

比前者少了3bit信息。The above total bit value is:

3bit less information than the former.

Therefore, in the LTE-A system of the embodiment of the present invention, in the RRC_CONNECTED state, if the uplink is still in an unsynchronized state when the downlink data of the UE arrives, the eNB can send the information frame of the DCI format 1A format to the UE through the PDCCH , where in addition to carrying the random access code and the physical random access channel index corresponding to the uplink random access resource, the corresponding uplink carrier identification information can also be added; where the uplink carrier identification information can be the uplink carrier number, or the uplink carrier frequency Point information, here is an example of the uplink carrier number:

-Flag for format0/format 1A differentiation-1bit;

-Localized/Distributed VRB assignment flag-1bit;

-Preamble Index-6bits;

-PRACH Mask Index-4bits;

-CarrierIndex-3bits//The reserved bits are used to carry the uplink carrier number.

Then the UE performs an uplink random access process by sending a random access code on the uplink random access resource specified by the physical random access channel index on the uplink carrier corresponding to the uplink carrier number; after the eNB detects the random access code , sending a random access response on the downlink carrier, so that the UE accesses the eNB.

The method for uplink random access of the user equipment to the base station provided in this embodiment, in an LTE-A system with multiple uplink carriers, the base station can use the same random access code, the same physical The random access channel index is allocated to different UEs (corresponding to different uplink carriers) at the same time, thereby greatly improving the utilization rate of the random access code, and since the uplink carrier identification information clearly indicates the uplink carrier, it is beneficial to balance the access load.

In addition, relative to event ④, the uplink carrier identification information can also be passed through the radio resource configuration dedicated information element (RadioResourceConfigDedicated IE) carried in the RRC connection establishment message, RRC connection reestablishment message or RRC connection reconfiguration message before the downlink data reaches the UE. , so that the UE knows which corresponding uplink carrier to send when it receives the random access code and the same physical random access channel index. Specifically:

RadioResourceConfigDedicated::=SEQUENCE{

srb-ToAddModifyList SRB-ToAddModifyList OPTIONAL, --need ON

drb-ToAddModifyList DRB-ToAddModifyList OPTIONAL, --need ON

drb-ToReleaseList DRB-ToReleaseList OPTIONAL, --need ON

mac-MainConfig CHOICE{

explicitValue MAC-MainConfiguration,

defaultValue NULL

} OPTIONAL, --Need ON

sps-Configuration SPS-Configuration OPTIONAL, --Need ON

physicalConfigDedicated PhysicalConfigDedicated OPTIONAL, --Cond Misc

UE-specific-ra-CarrierIndex INTEGER(1..8) OPTIONAL}

...

}

Therefore, when the UE receives the information frame carrying the random access code and the physical random access channel index sent by the base station through the PDCCH, but the uplink is not synchronized, it can use the RRC connection establishment message, the RRC connection reestablishment message or the RRC The random access code is sent on the uplink carrier corresponding to the uplink carrier identification information assigned in the connection reconfiguration message; thus, after the UE receives the random access response message, the uplink random access process is completed.

FIG. 3 is a schematic flowchart of a third embodiment of a method for uplink random access of a user equipment to a base station according to the present invention. This embodiment is mainly aimed at the scenario of the handover process of the UE from the source base station to the target base station, and the eNB in the above event ③ triggers the uplink random access process initiated by the UE at the RRC layer. As shown in Figure 3, it includes the following steps:

Step 301, the UE obtains the uplink carrier identification information issued by the target base station and forwarded through the RRC connection reconfiguration message of the source base station, as well as the random access code and the physical random access channel index;

The uplink carrier identification information, as well as the random access code and the physical random access channel index may be carried in the random access channel configuration dedicated information element (RACH-ConfigDedicated IE) of the RRC connection reconfiguration message;

Step 302, the UE sends a random access code to the base station on the uplink carrier corresponding to the uplink carrier identification information and on the uplink random access resource corresponding to the physical random access channel index;

Step 303, the UE receives the random access response message sent by the base station after detecting the random access code, and completes the uplink random access from the UE to the base station.

Wherein, for event ③: in the context of the handover process of the UE from the source base station to the target base station, the required uplink random access process is described in detail.

During the handover process of the UE from the source base station to the target base station, the target base station carries downlink access system information and uplink random access resource information in the handover response message to the source base station; where the uplink random access resource information can be All shared uplink random access resource information or dedicated uplink random access resource information, in the embodiment of the present invention, because it is in a non-conflict-based scenario, it is dedicated uplink random access resource information, namely The specified uplink random access resources and random access codes; the source base station forwards the relevant dedicated uplink random access resource information to the UE in the RRC connection reconfiguration message, so as to help the UE establish a connection with the target base station in the shortest time connect.

In the non-conflict-based handover process, the target base station adds uplink carrier identification information, which can be the carrier number or carrier frequency, while carrying the dedicated uplink random access resource information in the handover response message to the source base station. point information, the source base station forwards relevant information, including uplink carrier identification information, random access code and physical random access channel index, to the UE in the RRC connection reconfiguration message, and can use but not limited to the following methods to indicate the above information, The base station carries the uplink carrier identification information, random access code and physical random access channel index in the RACH-ConfigDedicated IE of the RRC connection reconfiguration message. Here, the carrier number is used as an example for illustration:

RACH-ConfigDedicated::=SEQUENCE{

ra-PreambleIndex INTEGER(1..64), (6bit)

ra-PRACH-MaskIndex INTEGER(0..15)(4bit)

ra-CarrierIndex INTEGER(1..8)(3bit)

}

The method for uplink random access of the user equipment to the base station provided in this embodiment, in the LTE-A system with multiple uplink carriers, the base station triggers the UE to initiate an uplink random access process at the RRC layer, and the same random access code, the same physical The random access channel index is allocated to different UEs (corresponding to different uplink carriers) at the same time, thereby greatly improving the utilization rate of the random access code, and since the uplink carrier identification information clearly indicates the uplink carrier, it is beneficial to balance the access load.

FIG. 4 is a schematic flowchart of a fourth embodiment of a method for uplink random access of a user equipment to a base station according to the present invention. This embodiment is mainly aimed at the scenario of the handover process of the UE from the source base station to the target base station, and the eNB in the above event ③ triggers the uplink random access process initiated by the UE at the RRC layer. As shown in Figure 4, it includes the following steps:

Step 401, the UE obtains the uplink carrier identification information, random access code and physical random access channel index sent by the target base station and forwarded through the RRC connection reconfiguration message of the source base station;

Wherein, the uplink carrier identification information may be carried in the radio resource configuration dedicated information element of the RRC connection reconfiguration message, specifically:

RadioResourceConfigDedicated::=SEQUENCE{

srb-ToAddModifyList SRB-ToAddModifyList OPTIONAL, --need ON

drb-ToAddModifyList DRB-ToAddModifyList OPTIONAL, --need ON

drb-ToReleaseList DRB-ToReleaseList OPTIONAL, --need ON

mac-MainConfig CHOICE{

explicitValue MAC-MainConfiguration,

defaultValue NULL

} OPTIONAL, --Need ON

sps-Configuration SPS-Configuration OPTIONAL, --Need ON

physicalConfigDedicated PhysicalConfigDedicated OPTIONAL, --Cond Misc

UE-specific-ra-CarrierIndex INTEGER(1..8)OPTIONAL}

...

}

The random access code and physical random access channel index can be carried in the random access channel configuration dedicated information element (RACH-ConfigDedicated IE) of the RRC connection reconfiguration message, specifically:

RACH-ConfigDedicated::=SEQUENCE{

ra-PreambleIndex INTEGER(1..64), (6bit)

ra-PRACH-MaskIndex INTEGER(0..15)(4bit)

}

Step 402, the UE sends a random access code to the base station on the uplink carrier corresponding to the uplink carrier identification information and on the uplink random access resource corresponding to the physical random access channel index;

Step 403, the UE receives the random access response message sent by the base station after detecting the random access code, and completes the uplink random access from the UE to the base station.

In this embodiment, the uplink carrier information is configured in another IE of the RRC connection reconfiguration message, and the same random access code and the same physical random access channel index can be allocated to different UEs at the same time (corresponding to different uplink carrier), thereby greatly improving the utilization rate of the random access code, and since the uplink carrier identification information clearly indicates the uplink carrier, it is beneficial to balance the access load.

It should be noted that, for the uplink carrier corresponding to the random access code and physical random access channel index mentioned in the embodiment of the present invention, the uplink carrier identification information may not be carried in the message delivered by the base station in a displayed manner, Instead, an implicit method is used to indicate the uplink carrier corresponding to the random access code and the physical random access channel index, for example, the physical random access channel index can be specified to correspond to different uplink carriers.

Fig. 5 is a schematic structural diagram of a user equipment according to an embodiment of the present invention. As shown in FIG. 5 , the user equipment 5 includes: an acquiring module 51 , a sending module 52 and a receiving module 53 . Among them, the obtaining module 51 is used to obtain the uplink carrier identification information issued by the base station, as well as the random access code and the physical random access channel index; Send the random access code to the base station on the uplink random access resource corresponding to the access channel index; the receiving module 53 is used to receive the random access response message sent by the base station after detecting the random access code, and complete the uplink from the user equipment to the base station random access.

Wherein, the uplink carrier identification information may be uplink carrier number information or uplink carrier frequency point information. The user equipment can receive an information frame in the format of 1A downlink control information sent by the base station through the physical downlink control channel, and the information frame carries the uplink carrier identification information; The uplink carrier identification information forwarded by the radio resource control RRC connection reconfiguration message; the user equipment can also receive the RRC connection establishment message or the RRC connection reestablishment message carrying the uplink carrier identification information issued by the base station, and obtain the RRC connection establishment message or RRC connection Reconstruct the uplink carrier identification information in the message.

The specific method for implementing the uplink random access of the user equipment to the base station in this embodiment may refer to the description in the above-mentioned embodiment of the method for the user equipment to uplink random access to the base station, and details are not repeated here.

The user equipment provided in this embodiment can prevent the UE from randomly selecting an uplink carrier to send a random access code through the uplink carrier identification information assigned by the base station to the UE, and can also avoid limiting an uplink carrier to correspond to a downlink carrier. Sending random access codes is beneficial to access load balancing; and since the same random access codes can be configured to be sent on different uplink carriers, the same random access codes can be allocated to different UEs at the same time (corresponding to different uplink carrier), thereby greatly improving the utilization rate of random access codes.

FIG. 6 is a schematic structural diagram of a base station according to an embodiment of the present invention. As shown in FIG. 6 , the base station 6 includes: a first sending module 61 , a receiving module 62 , a detection module 63 and a second sending module 64 . Among them, the first sending module 61 is used to send the uplink carrier identification information, as well as the random access code and the physical random access channel index to the user equipment; the receiving module 62 is used to receive the user equipment on the uplink carrier corresponding to the uplink carrier identification information , the random access code sent on the uplink random access resource corresponding to the physical random access channel index; the detection module 63 is used to detect the random access code received by the receiving module 62; the second sending module 64 is used to detect After module 63 detects the random access code, it sends a random access response message to the user equipment to complete the uplink random access from the user equipment to the base station.

Wherein, the uplink carrier identification information may be uplink carrier number information or uplink carrier frequency point information. The base station may send an information frame whose format is 1A downlink control information, and the information frame carries uplink carrier identification information; it may also be that the uplink carrier identification information issued by the target base station is forwarded to the user equipment through the RRC connection reconfiguration message of the source base station; The base station sends an RRC connection establishment message or an RRC connection reestablishment message carrying uplink carrier identification information to the user equipment.

The specific method for the user equipment to randomly access the base station in uplink that can be implemented by the base station in this embodiment can refer to the description in the above-mentioned embodiment of the method for uplink random access of the user equipment to the base station, and will not be repeated here.

The base station provided in this embodiment can prevent the UE from randomly selecting an uplink carrier to send a random access code through the uplink carrier identification information assigned by the base station to the UE, and can also avoid restricting an uplink carrier to correspond to a downlink carrier to send a random access code. Random access codes are beneficial to access load balancing; and since the same random access codes can be configured to be sent on different uplink carriers, the same random access codes can be allocated to different UEs at the same time (corresponding to different uplink carrier), thereby greatly improving the utilization rate of random access codes.

FIG. 7 is a schematic structural diagram of a system for uplink random access of a user equipment to a base station according to an embodiment of the present invention. As shown in FIG. 7 , the system includes a base station 71 and user equipment 72 . Among them, the base station 71 sends the uplink carrier identification information, as well as the random access code and the physical random access channel index to the user equipment 72; The random access code sent on the uplink random access resource corresponding to the index; after the random access code is detected, a random access response message is sent to the user equipment 72, and the uplink random access from the user equipment 72 to the base station 71 is completed; the user equipment 72 Obtain the uplink carrier identification information issued by the base station 71, as well as the random access code and the physical random access channel index; on the uplink carrier corresponding to the uplink carrier identification information, on the uplink random access Send the random access code to the base station 71 on the resource; receive the random access response message sent by the base station 71 after detecting the random access code, and complete the uplink random access from the user equipment 72 to the base station 71.

In the system provided by this embodiment, the user equipment randomly accesses the base station in uplink, through the uplink carrier identification information assigned by the base station to the UE, it can avoid the UE from randomly selecting an uplink carrier to send a random access code, and can also avoid limiting an uplink carrier The random access code should be sent corresponding to the downlink carrier, which is beneficial to access load balancing; and since the same random access code can be configured to be sent on different uplink carriers, the same random access code can be allocated at the same time to different UEs (corresponding to different uplink carriers), thereby greatly improving the utilization rate of random access codes.

Those of ordinary skill in the art can understand that all or part of the processes in the methods of the above embodiments can be implemented through computer programs to instruct related hardware, and the programs can be stored in a computer-accessible storage medium. During execution, it may include the processes of the embodiments of the above-mentioned methods. Wherein, the storage medium may be a magnetic disk, an optical disk, a read-only memory (Read-Only Memory, ROM) or a random access memory (Random Access Memory, RAM), etc.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: it can still be Modifications are made to the technical solutions described in the foregoing embodiments, or equivalent replacements are made to some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims (17)

1. the method for a subscriber equipment uplink random access base station is characterized in that, comprising:

Obtain the up-link carrier identification information that the base station issues, and random access code and Physical Random Access Channel index;

Sending described random access code on the up-link carrier of described up-link carrier identification information correspondence, on the uplink random access resources corresponding to described base station with described Physical Random Access Channel index;

Receive described base station and detecting the accidental access response message that sends behind the described random access code, finish the uplink random access of subscriber equipment to described base station.

2. method according to claim 1 is characterized in that, described up-link carrier identification information is up-link carrier number information or up-link carrier frequency point information.

3. method according to claim 1 and 2 is characterized in that, describedly obtains the up-link carrier identification information that the base station issues and specifically comprises:

It is the information frame of 1A Downlink Control Information by the form that Physical Downlink Control Channel sends that described subscriber equipment receives described base station, carries described up-link carrier identification information in the described information frame.

4. method according to claim 1 and 2 is characterized in that, describedly obtains the up-link carrier identification information that the base station issues and specifically comprises:

Described subscriber equipment obtains the up-link carrier identification information that is issued by target BS and pass through the radio resource control RRC connection reconfiguration forwards of source base station.

5. method according to claim 4 is characterized in that, described up-link carrier identification information is carried in the Random Access Channel configuration Proprietary Information unit or radio-resource-configuration Proprietary Information unit of described RRC connection reconfiguration message.

6. method according to claim 1 and 2 is characterized in that, describedly obtains the up-link carrier identification information that the base station issues and specifically comprises:

Described subscriber equipment receives the RRC that carries described up-link carrier identification information that described base station issues and connects and set up message, RRC connection reconstruction message or RRC and connect reconfiguration message, and obtains described RRC and connect and set up message, RRC connection reconstruction message or RRC and connect described up-link carrier identification information in the reconfiguration message.

7. method according to claim 6 is characterized in that, described up-link carrier identification information is carried at described RRC and connects in the radio-resource-configuration Proprietary Information unit of setting up message, RRC connection reconstruction message or RRC connection reconfiguration message.

8. the method for a subscriber equipment uplink random access base station is characterized in that, comprising:

Issue the up-link carrier identification information, and random access code and Physical Random Access Channel are indexed to subscriber equipment;

Receive described subscriber equipment at the described random access code that on the up-link carrier of described up-link carrier identification information correspondence, on the uplink random access resources corresponding, sends with described Physical Random Access Channel index;

After detecting described random access code, send accidental access response message, finish of the uplink random access of described subscriber equipment to the base station to described subscriber equipment.

9. method according to claim 8 is characterized in that, described up-link carrier identification information is up-link carrier number information or up-link carrier frequency point information.

10. according to Claim 8 or 9 described methods, it is characterized in that the described up-link carrier identification information that issues specifically comprises:

It is the information frame of 1A Downlink Control Information that described base station sends form by Physical Downlink Control Channel, carries described up-link carrier identification information in the described information frame.

11. according to Claim 8 or 9 described methods, it is characterized in that the described up-link carrier identification information that issues specifically comprises:

The described up-link carrier identification information that target BS issues passes through the radio resource control RRC connection reconfiguration forwards of source base station to described subscriber equipment.

12. method according to claim 11 is characterized in that, described up-link carrier identification information is carried in the Random Access Channel configuration Proprietary Information unit or radio-resource-configuration Proprietary Information unit of described RRC connection reconfiguration message.

13. according to Claim 8 or 9 described methods, it is characterized in that the described up-link carrier identification information that issues specifically comprises:

Described base station issues the RRC connection of carrying described up-link carrier identification information and sets up message, RRC connection reconstruction message or RRC connection reconfiguration message to described subscriber equipment.

14. method according to claim 13 is characterized in that, described up-link carrier identification information is carried at described RRC and connects in the radio-resource-configuration Proprietary Information unit of setting up message, RRC connection reconstruction message or RRC connection reconfiguration message.

15. a subscriber equipment is characterized in that, comprising:

Acquisition module is used to obtain the up-link carrier identification information that the base station issues, and random access code and Physical Random Access Channel index;

Sending module, be used in described up-link carrier identification information correspondence up-link carrier, on the uplink random access resources corresponding, send described random access code to described base station with described Physical Random Access Channel index;

Receiver module is used to receive described base station and is detecting the accidental access response message that sends behind the described random access code, finishes the uplink random access of subscriber equipment to described base station.

16. a base station is characterized in that, comprising:

First sending module is used to issue the up-link carrier identification information, and random access code and Physical Random Access Channel are indexed to subscriber equipment;

Receiver module is used to receive described subscriber equipment at the up-link carrier of described up-link carrier identification information correspondence, the described random access code that sends on the uplink random access resources corresponding with described Physical Random Access Channel index;

Detection module is used to detect the described random access code that described receiver module receives;

Second sending module is used for after described detection module detects described random access code, sends accidental access response message to described subscriber equipment, finishes the uplink random access of described subscriber equipment to the base station.

17. the system of a subscriber equipment uplink random access base station is characterized in that, comprising: base station and subscriber equipment,

Described base station issues the up-link carrier identification information, and random access code and Physical Random Access Channel are indexed to described subscriber equipment; Receive described subscriber equipment at the described random access code that on the up-link carrier of described up-link carrier identification information correspondence, on the uplink random access resources corresponding, sends with described Physical Random Access Channel index; After detecting described random access code, send accidental access response message, finish of the uplink random access of described subscriber equipment to the base station to described subscriber equipment;

Described subscriber equipment obtains the up-link carrier identification information that described base station issues, and random access code and Physical Random Access Channel index; Sending described random access code on the up-link carrier of described up-link carrier identification information correspondence, on the uplink random access resources corresponding to described base station with described Physical Random Access Channel index; Receive described base station and detecting the accidental access response message that sends behind the described random access code, finish the uplink random access of subscriber equipment to described base station.

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