CN112702791B - Resource allocation method for sounding reference signals under multiple BWPs (broadband-random access protocols) - Google Patents
Resource allocation method for sounding reference signals under multiple BWPs (broadband-random access protocols) Download PDFInfo
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Abstract
The invention particularly relates to a resource allocation method of a sounding reference signal under multiple BWPs, which comprises the following steps: step 1, determining an SRS resource set according to configuration; step 2, in the initialization stage of resource non-allocation, marking all symbol resources in the set V as f; step 3, allocating resources according to BWP indexes activated by the access UE; and 4, step 4: and updating the SRS resource set. The invention overcomes the problem of resource waste caused by the fact that when the sounding reference signal is distributed to the UE under the condition of multiple BWPs in the prior art, the sounding reference signal resource which is much more than the preset number of users needs to be reserved, meets the support of the system to the preset number of users by using the sounding reference signal resource as less as possible, and improves the utilization rate of wireless resources.
Description
Technical Field
The present invention relates to the field of communications, and in particular, to a resource allocation method for sounding reference signals under multiple BWPs.
Background
In NR (New Radio), a Sounding Reference Signal (SRS) is used for detection of an uplink channel condition, beam management, maintenance of uplink synchronization, and the like. In a NR cell, a plurality of BWPs (bandwidth parts) are supported, the bandwidth of each BWP is flexibly configured, and a UE (User Equipment) can only receive signals in the bandwidth range where the BWP is active. And the base station allocates at least one SRS resource set to the UE, wherein each SRS resource set at least comprises one SRS resource.
For example, under typical two BWP configurations, a BWP with a small bandwidth and a BWP with a large bandwidth are configured, and if the existing SRS resource allocation method based on LTE is adopted, the total number of users supported by 2 BWPs is analyzed and counted according to the number of UEs that each BWP needs to support, but in order to adapt to the flexible variation of the number of users under each BWP, a large number of SRS resources need to be allocated to each BWP, which further results in a large amount of SRS resource waste. Therefore, NR needs to introduce a new allocation method.
Disclosure of Invention
The invention provides a resource allocation method for sounding reference signals under multiple Radio bandwidths (NRBs), and aims to solve the problem that when an existing resource allocation algorithm for LTE sounding reference signals is applied to an NR (New Radio) multiple-BWP (partial bandwidth) scene, resources are wasted.
The technical scheme of the invention is that the resource allocation method of the sounding reference signal under multiple BWPs comprises the following steps:
step 1, determining an SRS (Sounding Reference Signal) resource set according to configuration:
step 1.1, determining a starting symbol index set V for SRS transmission in an SRS resource statistical window according to the SRS period, the slot index for transmitting the SRS, the number of OFDM or SC-OFDM symbols for transmitting the SRS in the corresponding slot and the configuration of the number of symbols for continuously transmitting the SRS by the UE;
Step 1.1a, when 1 SRS period is configured, the SRS period is used as an SRS resource statistical set;
step 1.1b, when a plurality of SRS periods are configured, taking the time corresponding to the least common multiple of the periods as an SRS resource statistical set, and determining an initial symbol index set V for SRS transmission in the SRS resource statistical set;
step 2, in the initialization stage of resource non-allocation, marking all symbol resources in the initial symbol index set V as f, wherein f represents flexibly used symbol resources;
step 3, allocating resources according to BWP indexes activated by the access UE:
step 3.1, configuring a plurality of BWPs for the NR cell, recording as BWP0, BWP1, … … and BWPx, and searching from a starting symbol index set V according to a preset sequence according to a BWP index activated by the accessed UE;
step 3.2, detecting whether the SRS symbol allocated with partial resources exists:
step 3.2a, if the SRS symbol exists, allocating resources to the accessed UE in the resources corresponding to the SRS symbol according to the sequence of frequency division, combing and code division;
step 3.2b, if no SRS symbol exists, entering step 3.3;
step 3.3, detecting whether the SRS symbol marked as f exists:
step 3.3a, if the SRS symbol exists, allocating resources to the accessed UE in the resources corresponding to the SRS symbol according to the sequence of frequency division, combing and code division, and re-marking the symbol as BWPx;
3.3b, if no SRS sign exists, ending the allocation of the BWP sounding reference signal;
and 4, step 4: updating the SRS resource set:
step 4.1, when the BWP is activated, the UE that is BWPx leaves the current BWP, releases the SRS resource occupied by the UE, and continues to update according to the following rules:
step 4.1a, if the resources represented by the frequency division, the comb division and the code division in the symbol where the SRS resource is not allocated to any UE, updating the mark of the UE from BWPx to f;
step 4.1b, if the resources represented by the frequency division, the comb division and the code division in the symbol where the SRS resource is still allocated to other UE, the mark is not changed and still is BWPx;
and 4.2, if new UE is accessed subsequently, the step 3 is carried out to distribute the SRS resource.
Further, in step 3.1, the symbol start position calculated from the first symbol or based on the cell id or BWP number, or the symbol start position calculated by combining the cell id and BWP number is defined as the predetermined sequence.
Further, in step 3.2, the SRS symbol for allocating partial resources refers to 1 or more SRS symbols starting from the SRS symbol, and resources represented by a combination of frequency division, comb division and code division thereof have been allocated to one or more UEs, but there are still one or more resources represented by a combination of frequency division, comb division and code division which are not allocated.
Further, in step 3.2, the frequency division, the combing and the code division are ordered in any order among the three.
The invention has the positive technical effects that:
1. the resource allocation method for the sounding reference signal under the multiple BWPs provided by the invention overcomes the problem of resource waste caused by the fact that more sounding reference signal resources than the preset number of users need to be reserved when the sounding reference signal is allocated to the UE under the multiple BWPs in the prior art.
2. The resource allocation method of the sounding reference signal under multiple BWPs meets the support of the system to the number of the predetermined users by using the sounding reference signal resources as few as possible, and improves the utilization rate of wireless resources.
Drawings
Fig. 1 is a flowchart illustrating the main steps of a method for allocating sounding reference signals under multiple BWPs according to the present invention.
Detailed Description
The invention is described in further detail below with reference to the drawings and specific examples.
Scene configuration: a frequency band of 3.5GHz, a system bandwidth of 100MHz and a cell identifier PCI of 1; the sub-carrier interval is 30kHz, 2 BWPs are configured, and the size of BWP0 is as follows
RB, BWP1 size of
The method comprises the following steps that (1) each RB and TDD frame structure is provided, 2 special time slots are arranged in 10 time slots (slots), each special time slot is provided with 2 uplink OFDM symbols, an SRS is distributed on the uplink symbols of the special time slots, a single port is configured for the SRS, and the SRS period is 80 time slots; each UE configures 1 SRS resource set, each SRS resource set includes 1 SRS resource, and each SRS resource includes 1 symbol. The number of the supported frequency division users is N fre4, the combs are NcombCode division is N2codeWhen 2, the number of users supportable by each symbol is known as: n is a radical of hydrogenfre×Ncomb×Ncode＝16。
As shown in fig. 1, the present invention provides a resource allocation method for sounding reference signals under multiple BWPs, including the following steps:
step 1, determining an SRS (Sounding Reference Signal) resource set according to configuration:
step 1.1, determining a starting symbol index set V for SRS transmission in an SRS resource statistical window according to the SRS period, the slot index for transmitting the SRS, the number of OFDM or SC-OFDM symbols for transmitting the SRS in the corresponding slot and the configuration of the number of symbols for continuously transmitting the SRS by the UE;
step 1.1a, when 1 SRS period is configured, the SRS period is used as an SRS resource statistical set;
step 1.1b, when a plurality of SRS periods are configured, taking the time corresponding to the least common multiple of the periods as an SRS resource statistical set, and determining an initial symbol index set V for SRS transmission in the SRS resource statistical set;
step 2, in the initialization stage of resource non-allocation, marking all symbol resources in the initial symbol index set V as f, wherein f represents flexibly used symbol resources;
step 3, allocating resources according to BWP indexes activated by the access UE:
Step 3.1, configuring a plurality of BWPs for the NR cell, recording as BWP0, BWP1, … … and BWPx, and searching from a starting symbol index set V according to a preset sequence according to a BWP index activated by the accessed UE;
step 3.2, detecting whether the SRS symbol allocated with partial resources exists:
step 3.2a, if the SRS symbol exists, allocating resources to the accessed UE in the resources corresponding to the SRS symbol according to the sequence of frequency division, combing and code division;
step 3.2b, if no SRS symbol exists, entering step 3.3;
step 3.3, detecting whether the SRS symbol marked as f exists:
step 3.3a, if the SRS symbol exists, allocating resources to the accessed UE in the resources corresponding to the SRS symbol according to the sequence of frequency division, combing and code division, and re-marking the symbol as BWPx;
3.3b, if no SRS symbol exists, ending the allocation of the BWP sounding reference signal;
and 4, step 4: updating the SRS resource set:
step 4.1, when the BWP is activated, the UE that is BWPx leaves the current BWP, releases the SRS resource occupied by the UE, and continues to update according to the following rules:
step 4.1a, if the resources represented by the frequency division, the comb division and the code division in the symbol where the SRS resource is not allocated to any UE, updating the mark of the UE from BWPx to f;
4.1b, if the resources represented by the frequency division, the comb division and the code division in the symbol where the SRS resource is still distributed to other UE, the mark is not changed and still is BWPx;
and 4.2, if new UE is accessed subsequently, the step 3 is carried out to distribute the SRS resource.
Further, in step 3.1, the symbol start position calculated from the first symbol or based on the cell id or BWP number, or the symbol start position calculated by combining the cell id and BWP number is defined as the predetermined sequence.
Further, in step 3.2, the SRS symbol for allocating partial resources refers to 1 or more SRS symbols starting from the SRS symbol, and resources represented by a combination of frequency division, comb division and code division thereof have been allocated to one or more UEs, but there are still one or more resources represented by a combination of frequency division, comb division and code division which are not allocated.
Further, in step 3.2, the order of the frequency division, the comb division and the code division is sorted in any order among the three.
In this embodiment, 2 BWPs are provided, BWP0 and BWP1 respectively.
The predetermined sequence is:
option 1: BWP0 and BWP1 both cycle through the symbol 0;
option 2: BWP0 starts from symbol 0, and searches circularly according to the ascending order of symbol indexes; BWP1 starts from symbol L/2, and searches circularly according to the ascending order of symbol indexes;
Option 3: BWP0 starts with symbol PCI mod i ═ 1, and searches cyclically in order of increasing symbol index; BWP1 Slave notation
Initially, the search is cycled through in order of increasing symbol index.
The UE0 accesses the cell activation BWP0, and starts the search in resource set V from symbol 1 if the predefined order of option 3 is adopted. Since there is no symbol labeled BWP0 in the set V and symbol 1 is labeled f, symbol 1 is allocated to UE0, and information such as frequency domain start RB (frequency division), comb index, code division index, slot index where symbol 1 is located, SRS symbol number and the like of the corresponding SRS resource is obtained according to the allocation order and allocated to UE0, and then symbol 1 is labeled BWP 0. At this point, symbol 1 becomes the SRS symbol allocated partial resources and labeled BWP 0.
If the next UE (UE1) accesses the cell, its active BWP is BWP0, and symbol 1 is assigned to UE1 as described in this section. Until BWP is activated, BWP0 has N after 16 th UE accessfre×Ncomb×NcodeSymbol 1 would still be allocated to the UE at 16, but at this point symbol 1 becomes the SRS symbol allocated all resources and labeled BWP 0.
The next active BWP is BWP0 having N after UE accessfre×Ncomb×NcodeThe symbol 2 is allocated to the UE when +1 is 17.
Step 4, SRS resource set updating;
Step 4.1, if the UE which activates BWPx leaves the current BWP, releasing the SRS resource occupied by the UE, and continuing to update according to the following rules:
step 4.1a, if the resources represented by the frequency division, the comb division and the code division in the symbol where the SRS resource is located are not allocated to any UE, updating the mark of the SRS resource from BWPx to f;
step 4.1b, otherwise, if the resources represented by the frequency division, the comb division and the code division in the symbol of the SRS resource are still allocated to other UEs, the mark is not changed and still is BWPx;
if UEy BWP is activated as BWP0, after UEy is handed over to another cell, the SRS resources occupied by UEy in the source cell are released. If the resources represented by frequency division, comb division and code division in the symbol of the SRS resource are still allocated to other UEs, the symbol k is marked as the SRS symbol which allocates partial resources and is marked as BWP 0;
if UEy BWP is activated as BWP0, after UEy is handed over to another cell, the SRS resources occupied by UEy in the source cell are released. If the resource represented by frequency division, comb division and code division in the symbol of the SRS resource is not allocated to any UE, the symbol k is updated to f by the SRS symbol marked as allocating partial resource and marked as BWP 0;
and 4.2, if new UE is accessed subsequently, the step 2 is switched to distribute the SRS resource.
The present invention is not limited to the above-described embodiments, and any variations, modifications, and alterations may be made by those skilled in the art without departing from the spirit of the present invention.
Claims (4)
1. A resource allocation method for sounding reference signals under multiple BWPs (multiple-BWPs), comprising the following steps:
step 1, determining an SRS resource set according to configuration:
step 1.1, according to the SRS period, the time slot index for sending the SRS, the number of OFDM or SC-OFDM symbols for sending the SRS in the corresponding time slot and the configuration of the number of continuously sending SRS symbols by UE, determining a starting symbol index set V for sending the SRS in an SRS resource statistical window;
step 1.1a, when 1 SRS period is configured, the SRS period is used as an SRS resource statistical set;
step 1.1b, when a plurality of SRS periods are configured, taking the time corresponding to the least common multiple of the periods as an SRS resource statistical set, and determining an initial symbol index set V for SRS transmission in the SRS resource statistical set;
step 2, in the initialization stage of resource non-allocation, marking all symbol resources in the initial symbol index set V as f, wherein f represents flexibly used symbol resources;
Step 3, allocating resources according to BWP indexes activated by the access UE:
step 3.1, configuring a plurality of BWPs for the NR cell, recording as BWP0, BWP1, … … and BWPx, and searching from a starting symbol index set V according to a preset sequence according to a BWP index activated by the accessed UE;
step 3.2, detecting whether the SRS symbol allocated with partial resources exists:
step 3.2a, if the SRS symbol exists, allocating resources to the accessed UE in the resources corresponding to the SRS symbol according to the sequence of frequency division, combing and code division;
step 3.2b, if no SRS symbol exists, entering step 3.3;
step 3.3, detecting whether the SRS symbol marked as f exists:
step 3.3a, if the SRS symbol exists, allocating resources to the accessed UE in the resources corresponding to the SRS symbol according to the sequence of frequency division, combing and code division, and re-marking the symbol as BWPx;
3.3b, if no SRS symbol exists, ending the allocation of the BWP sounding reference signal;
and 4, step 4: updating the SRS resource set:
step 4.1, when the BWP is activated, the UE that is BWPx leaves the current BWP, releases the SRS resource occupied by the UE, and continues to update according to the following rules:
step 4.1a, if the resources represented by the frequency division, the comb division and the code division in the symbol where the SRS resource is not allocated to any UE, updating the mark of the UE from BWPx to f;
4.1b, if the resources represented by the frequency division, the comb division and the code division in the symbol where the SRS resource is still distributed to other UE, the mark is not changed and still is BWPx;
and 4.2, if new UE is accessed subsequently, the step 3 is carried out to distribute the SRS resource.
2. The method according to claim 1, wherein in step 3.1, the predetermined sequence is a symbol start position calculated from a first symbol or based on a cell id or a BWP number, or a symbol start position calculated by combining the cell id and the BWP number.
3. The method of claim 1, wherein in step 3.2, the SRS symbols for allocating partial resources refer to 1 or more SRS symbols starting from the SRS symbol, and resources represented by a combination of frequency division, comb division and code division have been allocated to one or more UEs, but there are still one or more resources represented by a combination of frequency division, comb division and code division that are not allocated.
4. The method according to claim 1, wherein in step 3.2, the order of frequency division, comb division and code division is sorted in any order among the three.
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