CN101155393B - Uplink Scheduling Communication Method of Evolved Universal Terrestrial Radio Access System - Google Patents

Abstract

An uplink scheduling communication method for an evolved universal terrestrial wireless access system, in which a base station first identifies a user terminal sending a resource scheduling request to determine whether the user terminal is a predefined scheduling user terminal and whether it is in resource block scheduling , and when the user terminal is a predefined scheduled user terminal and is not at the first time of resource block scheduling, the base station sends the uplink scheduling information that includes the scheduling type information of the user terminal and omits the corresponding resource block allocation information In other cases, the base station sends the uplink scheduling grant signaling including the user terminal scheduling type information and the corresponding resource block allocation information, which can save signaling overhead and improve communication channel gain.

Description

Uplink Scheduling Communication Method of Evolved Universal Terrestrial Radio Access System

technical field

The invention relates to an uplink scheduling communication method of an evolved universal terrestrial wireless access system.

Background technique

At present, in the uplink scheduling of the Evolved Universal Terrestrial Radio Access (E_UTRA) system, the base station performs scheduling according to the scheduling request sent by the user terminal (UE), and sends a scheduling grant (scheduling grant) signaling through the downlink control channel, and the scheduling grant The content of the signaling is the scheduling result of the base station, including the allocation of resource blocks and the transmission rate of the user terminal. Table 1 lists the main content of the uplink scheduling grant signaling specified in the standard TR 25.814 [1] (3GPP TR 25.814V1.5.0, "Physical Layer Aspects for Evolved UTRA", the physical layer aspect of the evolved UTRA).

Table 1: Uplink Scheduling Grant Signaling Format

Since the uplink scheduling grant signaling belongs to control signaling, there are two encoding methods for control signaling, namely, independent encoding and joint encoding, where independent encoding means that each scheduled user terminal is individually encoded, and joint encoding is It means that all user terminals are encoded together, and different encoding methods have different signaling formats.

For example, in the independently coded uplink scheduling permission signaling format proposed by NTT DoCoMo, it stipulates that the user terminal identification is 9 bits, the allocation duration is 3 bits, and the transmission format is 8 bits (multi-antenna related content is 0 bits), The CRC check is 16 bits for each user terminal, and its resource block allocation identification adopts the method in the High-Speed Downlink Packet Access (HSDPA) system, that is, only the first resource allocated by the user terminal is identified block and the last resource block. In this way, when the system bandwidth is 10M, the number of resource blocks is 24, and the number of user terminals scheduled at one time is set to N _UE , the scheme is shown in Table 2:

User terminal identification 9*N_UE Resource block allocation 9*N_UE Assignment duration 3*N_UE Transmission format 8*N_UE CRC 16*N_UE

Table 2: NTT DoCoMo scheme

In the jointly coded uplink scheduling grant signaling format proposed by Nokia, the first part is resource block allocation, and each resource block is allocated a resource block type indication (RTI) bit. When the RTI bit is 1, it means that the next resource block is allocated to the same user terminal, and when the RTI bit is 0, it means that the next resource block is allocated to another user terminal. This resource block allocation identification method only needs at most the number of bits equal to the number of resource blocks, and the signaling overhead is relatively small. However, when some resource blocks are not allocated to any user terminal, additional bits are required for correct identification. The second part of the signaling format is allocation indication (AEI) bits, and each AEI bit indicates whether the resource block group marked in the first part is allocated. When the AEI bit is 1, it means that the resource block group is allocated to a certain user terminal during scheduling, and when the AEI bit is 0, it means that the corresponding resource block group is not allocated, and the following bits can be set to null values. The last part of the signaling format is used to indicate information including user terminal identification, allocation duration, and transmission format, among which, the user terminal identification is set to 9 bits, the allocation duration is set to 3 bits, the transmission format is set to 8 bits, and the resource block The number is set to N _RB , and the number of user terminals scheduled at one time is set to N _UE . The scheme is shown in Table 3:

Resource block allocation N_RB AEI bit ＜＝N_RB User terminal identification 9*N_UE Assignment duration 3*N_UE Transmission format 8*N_UE CRC 16

Table 3: Nokia solutions

However, in the recent Third Generation Partnership Project (Third Generation Partnership Project, 3GPP) standardization meeting (3GPP RAN2#53), three scheduling types were clearly defined:

1. Dynamic Allocation Scheduling: It means that both resource block scheduling and user terminal transmission rate scheduling are performed at the MAC layer;

2. Pre-defined allocation scheduling: resource block scheduling is performed at the radio resource control (RRC) layer, and user terminal transmission rate scheduling is performed at the media access control (MAC) layer;

3. Semi-Static Allocation Scheduling: It means that both resource block scheduling and user terminal transmission rate scheduling are performed at the RRC layer.

For dynamic and semi-persistent scheduling, resource block scheduling and user terminal transmission rate adjustment are both performed at the same layer, so the two results are generated synchronously, so that both types of information must be transmitted in the uplink scheduling grant signaling, and For the new predefined scheduling, the resource block scheduling is performed at the RRC layer, while the transmission rate of the user terminal is determined by the MAC layer. The generation of the two is no longer synchronized and the RRC layer scheduling is much slower than the MAC layer scheduling, which means In a period of time, only the transmission rate of the user terminal is changing, but the allocation of resource blocks remains unchanged. In this case, the resource block allocation information is still continuously transmitted in the scheduling permission signaling of the predefined scheduling user terminal, which is equivalent to continuously Transmission of redundant information increases signaling overhead, which is not conducive to improving communication efficiency.

Therefore, how to solve the shortcomings of the existing uplink scheduling grant signaling has become an urgent technical problem in the industry.

Contents of the invention

The purpose of the present invention is to provide an uplink scheduling communication method of an evolved universal terrestrial wireless access system, so as to save signaling overhead and increase the gain in communication channels.

In order to achieve the above object, the present invention provides an uplink scheduling communication method of an evolved universal terrestrial wireless access system, which includes steps: 1) the user terminal requesting scheduling sends a resource scheduling request to the base station; 2) the base station receives the user terminal's resource scheduling request; Resource scheduling request, and determine whether the user terminal is a predefined scheduling user terminal, if so, perform step 3), otherwise perform step 5); 3) The base station determines whether the user terminal is in the first resource block scheduling according to the resource scheduling request At a moment, if step 5) is performed, otherwise step 4) is performed; 4) the base station sends the uplink scheduling grant signaling that includes the user terminal scheduling type information and omits the corresponding resource block allocation information, wherein the user terminal scheduling type information is Information for indicating whether the user terminal is a predefined scheduled user terminal and whether it is at the first moment of resource block scheduling; 5) The base station sends an uplink scheduling grant message containing the user terminal scheduling type information and corresponding resource block allocation information make.

Wherein, the length of the user terminal scheduling type information is 1 bit, and when the user terminal is a predefined scheduling user terminal and not the first time of resource block scheduling, the user terminal scheduling type information is 1, and is 0 in other cases, When the uplink scheduling permission signaling in steps 4) and 5) adopts independent encoding, correspondingly, the information corresponding to resource block allocation includes resource block allocation information and allocation duration information, and the uplink scheduling in steps 4) and 5) When the grant signaling uses joint coding to send information, correspondingly, the information corresponding to resource block allocation includes user terminal identification information and allocation duration information.

To sum up, an uplink scheduling communication method for an evolved universal terrestrial wireless access system of the present invention identifies the user terminal requesting scheduling, so that when the base station sends the uplink scheduling permission signaling to the predefined scheduling user terminal The resource block allocation information scheduled by the user terminal may not be transmitted, which saves signaling overhead and increases the gain in the communication channel.

Description of drawings

FIG. 1 is an operation flowchart of the uplink scheduling communication method of the E-UTRAN system of the present invention.

Detailed ways

Please refer to FIG. 1, the uplink scheduling communication method of the evolved UTRAN system of the present invention includes the following steps:

S10: The user terminal requesting scheduling sends a resource scheduling request to the base station. For example, user terminal A sends a resource scheduling request. It should be noted that the resource scheduling request includes user identity information and other information. It is known to those skilled in the art, and will not be repeated here.

S11: The base station receives the resource scheduling request of user terminal A, performs scheduling, and judges whether user terminal A is a predefined scheduling user terminal according to the identity information contained in the resource scheduling request, and if so, executes step S12, otherwise executes step S14.

S12: The base station judges whether the user terminal A is currently in the first moment of resource block scheduling according to the resource scheduling request. If it is, execute step S14; Corresponding judgment results.

S13: The base station sends uplink scheduling grant signaling that includes the user terminal scheduling type information and omits the corresponding resource block allocation information, wherein the user terminal scheduling type information is used to indicate whether the user terminal is a predefined scheduling user terminal. And whether it is at the first moment of resource block scheduling, if the base station uses an independent coding method to generate the uplink scheduling grant signaling, the format of the uplink scheduling grant signaling at this time is shown in Table 4:

User terminal identification 9＊N_UE Scheduling type N_UE Transmission format 8＊N_UE CRC 16＊N_UE

Table 4 Uplink Scheduling Grant Signaling Format Using Independent Coding

It can be seen from Table 4 that the uplink scheduling grant signaling contains 1 bit of scheduling type indication information, and at the same time omits the corresponding resource block allocation information, that is, omits resource block allocation information and allocation duration information, wherein the scheduling type information is 1. However, if the base station adopts the uplink scheduling grant signaling generated by the joint coding method, the format of the uplink scheduling grant signaling at this time is shown in Table 5:

Resource block allocation N_RB AEI bit ＜＝N_RB Scheduling type ＜＝Number of AEI bits User terminal identification 9*(N_UE-N_PRE) Assignment duration 3*(N_UE-N_PRE)

Resource block allocation N_RB Transmission format 8*N_UE CRC 16

Table 5 Uplink Scheduling Grant Signaling Format Using Joint Coding

It can be seen from Table 5 that the uplink scheduling grant signaling contains 1 bit of scheduling type indication information, and at the same time omits the corresponding resource block allocation information, that is, omits the user terminal identification information and allocation duration information, wherein the scheduling type indication is 1.

S14: The base station sends the uplink scheduling grant signaling including the scheduling type information of the user terminal and the corresponding resource block allocation information, wherein the scheduling type information is 0, and similarly, if the base station uses an independent coding method to generate the uplink scheduling grant signaling, then At this time, the format of the uplink scheduling permission signaling is as shown in Table 6:

User terminal identification 9＊N_UE Scheduling type N_UE Resource block allocation 9＊(N_UE-N_PRE) Assignment duration 3*(N_UE-N_PRE) Transmission format 8＊N_UE CRC 16＊N_UE

Table 6: Uplink Scheduling Grant Signaling Format Using Independent Coding

It can be seen from Table 6 that the uplink scheduling grant signaling includes 1-bit scheduling type indication information, and also includes corresponding resource block allocation information, that is, resource block allocation information and allocation duration information. If the base station uses the uplink scheduling grant signaling generated by the joint coding method, the format of the uplink scheduling grant signaling at this time is shown in Table 7:

Resource block allocation N_RB AEI bit ＜＝N_RB Scheduling type ＜＝Number of AEI bits User terminal identification 9*(N_UE-N_PRE) Assignment duration 3*(N_UE-N_PRE) Transmission format 8*N_UE

Resource block allocation N_RB CRC 16

Table 7: Uplink Scheduling Grant Signaling Format Using Joint Coding

It can be seen from Table 7 that the uplink scheduling grant signaling contains 1 bit of scheduling type indication information, and also contains information about the allocation of corresponding resource blocks, that is, user terminal identification information and allocation duration information

The following will further compare the uplink scheduling communication method of the evolved UTRAN system of the present invention with the existing communication method:

First, assume that the bandwidth of the communication system is 10M, the number of resource blocks N _RB is 24, the number of user terminals N _UE that can be scheduled at one time is set to 8 and 24, and the number of predefined scheduled user terminals N _PRE is set to 6, then Table 8( a) List the existing uplink scheduling grant signaling overhead using independent coding under the aforementioned conditions, Table 8 (b) lists the uplink scheduling grant signaling overhead of the present invention using independent coding under the aforementioned conditions, Table 9 (a ) lists the existing uplink scheduling grant signaling overhead using joint coding under the aforementioned conditions, and Table 9 (b) lists the uplink scheduling grant signaling overhead of the present invention using joint coding under the aforementioned conditions,

N_UE＝8 N_UE＝24 User terminal identification 9＊N_UE 72 216 Resource block allocation 9＊N_UE 72 216 Assignment duration 3＊N_UE twenty four 72 Transmission format 8＊N_UE 64 192 CRC 16＊N_UE 128 384 Total 45＊N_UE 360 1080

Table 8(a): Existing uplink scheduling grant signaling overhead under independent coding

N_UE＝8 N_UE＝24 User terminal identification 9＊N_UE 72 216 Scheduling type N_UE 8 twenty four Resource block allocation 9＊(N_UE-N_PRE) 18 162

N_UE＝8 N_UE＝24 Assignment duration 3*(N_UE-N_PRE) 6 54 Transmission format 8＊N_UE 64 192 CRC 16＊N_UE 128 384 Total 296 1032 save bits 64 48

Table 8(b): Uplink scheduling grant signaling overhead of the present invention under independent coding

It can be seen from Table 8(a) and 8(b) that under independent coding, when the number of predefined scheduling user terminals in one scheduling is the same, if the number of user terminals that can be scheduled is less, the corresponding saving of signaling overhead will be greater. More, that is, the higher the proportion of predefined scheduling user terminals in one scheduling, the greater the gain achieved by using the communication method of the present invention.

N_UE＝8 N_UE＝24 Resource block allocation N_RB twenty four twenty four AEI bit ＜＝N_RB twenty four twenty four User terminal identification 9＊N_UE 72 216 Assignment duration 3＊N_UE twenty four 72 Transmission format 8＊N_UE 64 192 CRC 16 16 16 Total 224 544

Table 9(a): Existing uplink scheduling grant signaling overhead under joint coding

N_UE＝8 N_UE＝24 Resource block allocation N_RB twenty four twenty four

N_UE＝8 N_UE＝24 AEI bit ＜＝N_RB twenty four twenty four Scheduling type ＜＝Number of AEI bits twenty four twenty four User terminal identification 9＊(N_UE-N_PRE) 18 162 Assignment duration 3*(N_UE-N_PRE) 6 54 Transmission format 8＊N_UE 64 192 CRC 16 16 16 Total 176 496 save bits 48 48

Table 9(b): Uplink scheduling grant signaling overhead of the present invention under joint coding

It can be seen from Table 9(a) and 9(b) that under joint coding, when there are more user terminals in the predefined scheduling, the more signaling overhead can be saved by using the communication method of the present invention, and the greater the realized gain .

In summary, adopting the uplink scheduling communication method of the UTRAN system of the present invention can effectively save signaling overhead in communication and increase the gain in communication channels.

Claims (5)

1. the ascending scheduling communication method of the general land wireless access system of an evolution is characterized in that may further comprise the steps:

1) user terminal sends the scheduling of resource request to the base station, comprises user's identity information in the scheduling of resource request;

2) base station receives this scheduling of resource request, and judges according to the identity information that is comprised in the scheduling of resource request whether this user terminal is predefine dispatched users terminal, if execution in step 3 then), otherwise execution in step 5);

3) current the 1st moment that whether is in resource block scheduling of this user terminal judged according to this scheduling of resource request in the base station, if execution in step 5 then), otherwise execution in step 4);

4) base station sends the uplink scheduling allowance signaling that comprises the scheduling of user terminals type information and omit corresponding resource block assignments situation information, wherein, this scheduling of user terminals type information is to be used to indicate whether this user terminal is the information of predefine user terminal and the 1st moment that whether is in resource block scheduling;

5) base station sends the uplink scheduling allowance signaling that comprises this scheduling of user terminals type information and corresponding resource block assignments situation information.

2. the ascending scheduling communication method of the general land wireless access system of evolution as claimed in claim 1, it is characterized in that: described scheduling of user terminals type information length is 1.

3. the ascending scheduling communication method of the general land wireless access system of evolution as claimed in claim 2, it is characterized in that: when user terminal is predefine dispatched users terminal and the 1st moment that is not in resource block scheduling, described scheduling of user terminals type information is 1, and other situation is 0.

4. the ascending scheduling communication method of the general land wireless access system of evolution as claimed in claim 1, it is characterized in that: when uplink scheduling is permitted signaling employing absolute coding described step 4) and 5), correspondingly, the information of corresponding resource block assignments situation comprises resource block assignments information and distributes duration information.

5. the ascending scheduling communication method of the general land wireless access system of evolution as claimed in claim 1, it is characterized in that: when uplink scheduling allowance signaling adopts the combined coding mode to send information described step 4) and 5), correspondingly, the information of corresponding resource block assignments situation comprises user terminal identification information and distributes duration information.

Images