CN104427494B - The distribution method of Radio Network Temporary Identifier - Google Patents

Abstract

The present application discloses a method for assigning wireless network temporary identifiers. For the corresponding search space, the RNTI of the UE-specific search space and the common search space can be included at the same time, so that the starting position of the CCE occupied by the candidate PDCCH on each downlink subframe The number of elements in the index collection that is less than the preset upper limit of the index reaches a certain number. The invention can reduce the number of PRBs occupied by the PUCCH, make the number of PRBs available for the PUSCH more, and effectively improve the uplink peak rate and throughput.

Description

Method for assigning wireless network temporary identifiers

technical field

The present invention relates to mobile communication technology, in particular to a radio network temporary identifier (Radio Network Temporary Identifier, RNTI) distribution method.

Background technique

In an uplink subframe of an LTE system, physical resource block (PRB) resources of two time slots before and after a physical uplink control channel (PUCCH) are respectively located at two ends of available spectrum resources. The PUCCH of Format2/2a/2b is mapped to the extreme edge of the spectrum resource, followed by the PUCCH of Format1/1a/1b and Format2/2a/2b, and finally the PUCCH of Format1/1a/1b. For PUCCH resources in Format1/1a/1b format, whether it is a transmission scheduling request (SchedulingRequest, SR) or ACK, NACK information, an index can be used To represent. For HARQ ACK/NACK, resource index of PUCCH It is related to the first CCE number n _CCE occupied by the corresponding downlink PDCCH. In FDD mode, In TDD mode, in, is the total number of resource blocks within the system bandwidth, is the number of subcarriers under each resource block, and p takes a value satisfying N _p ≤ n _CCE <N _p+1 in the set {0, 1, 2, 3}.

In practical applications, the sum of the number of RBs of PUCCH and Physical Uplink Shared Channel (PUSCH) is the uplink bandwidth. In this way, on the premise of meeting the system capacity requirements, reducing the number of PRBs occupied by PUCCH as much as possible will help increase the number of PRBs available for PUSCH number, thereby increasing the uplink peak rate and throughput. Since the number of PRBs occupied by the PUCCH in Format1/1a/1b format is determined by The maximum value of is determined, so it can be reduced by reducing to reduce the number of PRBs occupied by the PUCCH in Format1/1a/1b format. exist Of the two components of the It is configured to the user equipment (UE) by radio resource control (RRC) signaling. After configured to the minimum acceptable value, the maximum value of limit n _CCE becomes reduced key.

For a given UE, there is a search space under each aggregation level L, the search space is composed of M ^(L) candidate PDCCHs, and the CCE start positions n _CCEs occupied by the candidate PDCCHs under all aggregation levels are formed A set, defined as: Among them, the aggregation level L∈{1,2,4,8}, m is the candidate PDCCH number, m=0,...,M ^(L) -1, M ^(L) is the number of candidate PDCCHs under a given aggregation level L See Table 1 for the value of M ^(L) . In practical applications, the search space is divided into a public search space and a UE-specific search space. For the public search space, Y _k =0; for the UE-specific search space, Y _k =(A·Y _k-1 )modD, Y _-1 =n _RNTI ≠0, n _RNTI is the RNTI of the UE, A=39827, D=65537, n _s is the time slot number. It can be seen from this that the value of RNTI determines the value of Y _k , and further determines the set of n _CCEs .

Table 1

Table 2

Table 2 shows the value range of RNTI in the existing specifications of the LTE system. Existing specifications stipulate random access-radio network temporary identifier (RA-RNTI), transmit power control-physical uplink control channel-radio network temporary identifier (TPC-PUCCH-RNTI), transmit power control-physical uplink shared channel-wireless network Temporary identifier (TPC-PUSCH-RNTI), paging-radio network temporary identifier (P-RNTI) and system information-radio network temporary identifier (SI-RNTI). The corresponding search space is located in the public search space. The number of control channel elements (CCEs) in the public search space is 0 to 15, and the number corresponding to n _CCEs is small, up to 12, and the corresponding downlink transmission usually does not need to occupy PUCCH resources for ACK /NACK feedback, so these types of RNTI values do not need to be limited. Since the search space corresponding to the Cell Radio Network Temporary Identity (C-RNTI), Semi-Persistent Scheduling (Semi-Persistent Scheduling) C-RNTI and Temporary (Temporary) C-RNTI includes a UE-specific search space, and the value range is very large (1 ~65523, decimal), resulting in a large range of n _CCE values corresponding to search spaces of different RNTIs and different aggregation levels.

It can be seen that in the existing system, because the value range of n _CCE in the search space corresponding to the Cell Radio Network Temporary Identity (C-RNTI) varies greatly, the value of n _CCE may be relatively large, which in turn will cause The value of is larger. In this way, the number of PRBs occupied by the PUCCH will be more, so that the number of PRBs available for the PUSCH will be less, resulting in lower uplink peak rate and throughput.

Contents of the invention

In view of this, the main purpose of the present invention is to provide a wireless network temporary identifier allocation method, which can effectively improve the uplink peak rate and throughput.

In order to achieve the above object, the technical scheme proposed by the present invention is:

A method for allocating temporary wireless network identifiers, comprising:

a. From the set of currently supported control domain configuration schemes, select an unselected control domain configuration scheme as the current control domain configuration scheme. According to the control domain configuration scheme, calculate The total number of CCEs that can be used by the PDCCH and the upper limit of the starting CCE position index of the downlink authorized PDCCH;

b. Select an unselected RNTI from the wireless network temporary identifier RNTI set of the system, and calculate the candidate PDCCH occupancy of the RNTI in each downlink subframe when the aggregation level L is each preset candidate level CCE starting position index set; for each downlink subframe, the CCE starting position index set occupied by all candidate PDCCHs of the RNTI on the downlink subframe is merged and repeated elements are deleted to obtain the RNTI in the downlink subframe A set of CCE starting position indexes occupied by candidate PDCCHs on the downlink subframe;

c. For the selected RNTI, determine whether the number of elements less than the upper limit in the CCE starting position index set occupied by the candidate PDCCH on each downlink subframe is greater than or equal to If yes, then add the RNTI to the assignable RNTI set corresponding to the current control domain configuration scheme, where n _{CCE, K} is the upper limit of the starting CCE position index of the uplink and downlink authorized PDCCH of the Kth downlink subframe; N _{ele, K} is the number of elements in the CCE starting position index set occupied by the candidate PDCCH on the Kth downlink subframe; N _{CCE, K} is the total number of CCEs that can be used by the PDCCH on the Kth downlink subframe; K is the downlink subframe number ;

d. If there is an unselected RNTI in the wireless network temporary identity set of the system, go to step b, otherwise go to step e;

e. If there is an unselected control domain configuration scheme in the set of currently supported control domain configuration schemes, perform step a, otherwise perform step f;

f. Determine the intersection of the assignable RNTI sets corresponding to each control domain configuration scheme in the currently supported set of control domain configuration schemes, and determine the intersection as a candidate for the RNTI whose corresponding search space can contain both the UE-specific search space and the public search space A set: determining the complement set of the intersection set in the wireless network temporary identity set of the system as a candidate set of RNTIs whose corresponding search spaces only contain common search spaces.

To sum up, the method for allocating wireless network temporary identifiers proposed by the present invention can include the RNTI of the UE-specific search space and the common search space at the same time for the corresponding search space, so that the CCE occupied by the candidate PDCCH on each downlink subframe The number of elements in the starting position index collection that is less than the preset index upper limit is greater than or equal to In this way, it can be ensured that the probability of taking a smaller value of n _CCE is greater, which in turn will make The value of is smaller, so that the number of PRBs occupied by the PUCCH can be reduced, and the number of PRBs available for the PUSCH can be larger, effectively improving the uplink peak rate and throughput.

Description of drawings

FIG. 1 is a schematic flow chart of Embodiment 1 of the present invention.

detailed description

In order to make the purpose, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

The core idea of the present invention is: according to certain rules, in the RNTI set defined by the existing specification, a subset is specially allocated to the RNTI type with UE-specific search space. The rule is: under a given control domain configuration of the RNTI in the subset, there are a certain number of candidate PDCCHs whose starting position numbers do not exceed a given threshold in multiple or each downlink subframe. In this way, the value of n _CCE can be made as small as possible, so that the number of PRBs occupied by the PUCCH can be reduced, and the uplink peak rate and throughput can be improved.

Fig. 1 is a schematic flow chart of Embodiment 1 of the present invention, as shown in Fig. 1, this embodiment mainly comprises:

Step 101, from the set of currently supported control domain configuration schemes, select an unselected control domain configuration scheme as the current control domain configuration scheme, and calculate each downlink subframe in a radio frame according to the control domain configuration scheme The total number of CCEs that can be used by the uplink PDCCH and the upper limit of the starting CCE position index of the downlink authorized PDCCH.

What needs to be explained here is that in practical applications, there will be multiple control domain configuration schemes supported by the system. Here, each control domain configuration scheme must be considered separately. Therefore, it is necessary to realize the traversal of the control domain configuration schemes through this step.

In this step, the specific calculation method of the total number of CCEs that can be used by the PDCCH on each downlink subframe is known by those skilled in the art, and will not be repeated here.

Here, setting the upper limit of the starting CCE position index of each downlink authorized PDCCH in each downlink subframe is to enable the system to control the starting CCE number n _CCE occupied by all downlink authorized PDCCHs within a certain range, so as to achieve as much as possible The purpose of reducing the number of PRBs occupied by the PUCCH and improving the uplink peak rate and throughput. Specifically, those skilled in the art can set an appropriate upper limit value through simulation according to the actual uplink peak rate and throughput requirements.

Step 102: Select an unselected RNTI from the radio network temporary identifier (RNTI) set of the system, and calculate the candidate of the RNTI when the aggregation level L is each preset candidate level in each downlink subframe The CCE start position index set occupied by the PDCCH; for each downlink subframe, the CCE start position index sets occupied by all candidate PDCCHs of the RNTI on the downlink subframe are merged and the repeated elements are deleted to obtain A set of CCE starting position indexes occupied by candidate PDCCHs of the RNTI on the downlink subframe.

In this step, firstly, for the selected RNTI, determine the set of CCE starting position index sets occupied by the candidate PDCCHs corresponding to the different aggregation levels on each downlink subframe, so that the RNTI will be in a downlink subframe. Corresponding to the CCE starting position index sets occupied by multiple candidate PDCCHs, and then merging the CCE starting position index sets occupied by multiple candidate PDCCHs on one downlink subframe, the repeated elements will be removed during the merging, and the merged The CCE start position index set occupied by the candidate PDCCH is used as the CCE start position index set occupied by the candidate PDCCH corresponding to the RNTI on the downlink subframe, and then the RNTI will be screened based on this set.

In this step, the candidate levels can be the same as the existing system, that is, L=1, L=2, L=4 and L=8 four levels, but considering that L=1 is not applicable to all control domain configuration schemes , preferably, the range of candidate levels can be set to 2, 4 and 8.

Step 103, for the selected RNTI, judge whether the number of elements less than the upper limit in the CCE starting position index set occupied by the candidate PDCCH on each downlink subframe is greater than or equal to If yes, the RNTI is added to the set of allocatable RNTIs corresponding to the current control domain configuration scheme.

Among them, n _{CCE, K} is the upper limit of the starting CCE position index of the uplink and downlink authorized PDCCH in the Kth downlink subframe; N _{ele, K} is the element in the CCE starting position index set occupied by the candidate PDCCH on the Kth downlink subframe The number; N _{CCE, K} is the total number of CCEs that can be used by the PDCCH on the Kth downlink subframe; K is the number of the downlink subframe.

In this step, the number of elements less than the upper limit in the CCE start position index set occupied by the candidate PDCCH on each downlink subframe of each RNTI in the set of allocatable RNTIs is greater than or equal to The n _CCE corresponding to each RNTI in the allocatable RNTI set can be made as small as possible, so as to meet the uplink peak rate and throughput requirements of the system.

Step 104, if there is an unselected RNTI in the wireless network temporary identity set of the system, go to step 102, otherwise go to step 105.

This step is used to implement the traversal of the wireless network temporary identifier set to find all RNTIs that can be added to the allocatable RNTI set corresponding to the current control domain configuration scheme.

Step 105 , if there is an unselected control domain configuration scheme in the set of currently supported control domain configuration schemes, execute step 101 , otherwise execute step 106 .

This step is used to realize the traversal of the set of currently supported control domain configuration schemes.

Step 106: Determine the intersection of the assignable RNTI sets corresponding to each control domain configuration scheme in the currently supported set of control domain configuration schemes, and determine the intersection as the corresponding search space that can contain both the UE-specific search space and the RNTI of the public search space A candidate set: determining the complement of the intersection set in the wireless network temporary identity set of the system as a candidate set whose corresponding search space only includes RNTIs in a common search space.

In this step, by restricting the candidate set of RNTIs that the corresponding search space can contain UE-specific search space and common search space at the same time, making it the intersection of the set of allocatable RNTIs corresponding to each control domain configuration scheme, so as to ensure that the RNTIs corresponding to these RNTIs n The _CCE should be as small as possible to meet the system's uplink peak rate and throughput requirements.

Specifically, the corresponding search space can include both UE-specific search space and public search space. The RNTI includes: Cell Radio Network Temporary Identity (C-RNTI), Semi-Persistent Scheduling (Semi-Persistent Scheduling) C-RNTI and Temporary ( Temporary) C-RNTI.

Specifically, the RNTI used to determine only the common search space includes: Random Access-Radio Network Temporary Identity (RA-RNTI), Transmit Power Control-Physical Uplink Control Channel-Radio Network Temporary Identity (TPC-PUCCH-RNTI ), transmit power control-physical uplink shared channel-radio network temporary identifier (TPC-PUSCH-RNTI), paging-radio network temporary identifier (P-RNTI) and system information-radio network temporary identifier (SI-RNTI).

To sum up, the above are only preferred embodiments of the present invention, and are not intended to limit the protection scope of the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the protection scope of the present invention.

Claims (4)

1. A method for allocating a Radio Network Temporary Identifier (RNTI), comprising:

a. selecting an unselected control domain configuration scheme from a currently supported control domain configuration scheme set as a current control domain configuration scheme, and calculating the total number of Control Channel Elements (CCEs) which can be used by a Physical Downlink Control Channel (PDCCH) on each downlink subframe in a wireless frame and the initial CCE position index upper limit of the downlink grant PDCCH according to the control domain configuration scheme;

b. selecting an unselected RNTI from a Radio Network Temporary Identifier (RNTI) set of a system, and calculating a CCE initial position index set occupied by a candidate PDCCH of the RNTI when the aggregation level L of each downlink subframe is respectively preset each candidate level; for each downlink subframe, combining CCE initial position index sets occupied by all candidate PDCCHs of the RNTI on the downlink subframe and deleting repeated elements in the CCE initial position index sets to obtain the CCE initial position index sets occupied by the candidate PDCCHs of the RNTI on the downlink subframe;

c. for the selected RNTI, judging whether the number of elements smaller than the upper limit in a CCE initial position index set occupied by the candidate PDCCH on each downlink subframe is larger than or equal to the upper limitIf yes, adding the RNTI into an allocable RNTI set corresponding to the current control domain configuration scheme, wherein n is_CCE,KAn upper limit of an initial CCE position index of a downlink authorized PDCCH for a Kth downlink subframe; n is a radical of_ele,KThe number of elements in a CCE initial position index set occupied by the candidate PDCCH on the Kth downlink subframe; n is a radical of_CCE,KThe total number of CCEs that can be used by the PDCCH on the Kth downlink subframe; k is a downlink subframe number;

d. if the radio network temporary identifier set of the system has the RNTI which is not selected, the step b is carried out, otherwise, the step e is carried out;

e. if one unselected control domain configuration scheme exists in the current supported control domain configuration scheme set, executing the step a, otherwise, executing the step f;

f. determining the intersection of the assignable RNTI sets corresponding to each control domain configuration scheme in the current supported control domain configuration scheme set, and determining the intersection as a candidate set of RNTIs of which the corresponding search space can simultaneously contain a UE (user equipment) dedicated search space and a public search space; and determining the complementary set of the intersection in the radio network temporary identifier set of the system as a candidate set of RNTIs of which the corresponding search spaces only contain common search spaces.

2. The method of claim 1, wherein the corresponding search space can contain both RNTIs of the UE-specific search space and the common search space comprises: the cell radio network Temporary identifier C-RNTI, the Semi-Persistent Scheduling C-RNTI and the Temporary Temporary C-RNTI.

3. The method of claim 1, wherein the corresponding search space only contains the RNTI of the common search space comprises: the system comprises a random access-radio network temporary identifier RA-RNTI, a transmission power control-physical uplink control channel-radio network temporary identifier TPC-PUCCH-RNTI, a transmission power control-physical uplink shared channel-radio network temporary identifier TPC-PUSCH-RNTI, a paging-radio network temporary identifier P-RNTI and a system information-radio network temporary identifier SI-RNTI.

4. The method of claim 1, wherein the candidate levels comprise 2,4, and 8.