CN101841919A - Resource allocation method and device - Google Patents
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Abstract
The invention discloses a resource allocation method and a resource allocation device for realizing the allocation of a D-SR resource. The resource allocation method provided by the invention comprises the following steps of: determining user equipment UE to be allocated with the dedicated scheduling request D-SR resource; determining a D-SR resource allocation priority queue consisting of the UE according to a preset priority order; and allocating the preset D-SR resource to the UE in the D-SR resource allocation priority queue according to the priority order.
Description
Technical Field
The present invention relates to the field of communications technologies, and in particular, to a resource allocation method and apparatus.
Background
A Long Term Evolution (LTE) system is a scheduling-based communication system, and if data needs to be sent in a sending buffer of a User Equipment (UE), the UE needs to send a Buffer Status Report (BSR) to an evolved node b (eNB) first to notify the eNB of data information that needs to be sent in the current sending buffer of the UE. After receiving the BSR transmitted by the UE, the eNB allocates a corresponding uplink shared channel (UL-SCH) resource to the UE according to the amount of data that the UE needs to transmit, and notifies the UE to transmit data on the allocated UL-SCH resource.
The UE sends BSR to the eNB and needs to use UL-SCH resources, if the UE has BSR to report but does not have the UL-SCH resources allocated to the UE at the moment, the UE sends a Scheduling Request (SR) to the eNB to Request the eNB to allocate the UL-SCH resources for the BSR needing to be sent.
There are two ways for the UE to send the SR: one is to transmit an SR through a dedicated scheduling request resource (D-SR resource); another is to transmit the SR through a random access procedure.
When the UE and the eNB are in a synchronous state, D-SR resources are not necessary, and when the UE and the eNB are in an asynchronous state, the D-SR resources are not necessary. The D-SR resource is a resource for transmitting the D-SR.
The basic principle of the UE for sending the SR is as follows: the SR is not transmitted through the random access procedure as long as the D-SR resource exists.
Time limit of UE SR transmission: the SR may be repeatedly transmitted on a resource capable of transmitting the SR before receiving UL-SCH resources allocated by the eNB for transmitting data to the UE.
In the LTE system, the D-SR resource is configured by a Radio Resource Control (RRC) layer, and is carried by a Physical Uplink Control Channel (PUCCH), i.e., an uplink dedicated scheduling request SR transmitted by a UE is transmitted on the PUCCH in a format1/1a/1b (i.e., format1/1a/1b) of the PUCCH.
For PUCCH format1/1a/1b, one symbol is multiplied by a cyclic shift sequence with length 12 to perform frequency domain spreading, so as to form a symbol sequence with length 12, and then the symbol sequence is multiplied by an orthogonal sequence with length 4 to perform time domain spreading, and is mapped to 12 × 4 time frequency positions (3 symbols are used for transmitting SR) of a corresponding Physical Resource Block (PRB) on a slot.
However, a technical solution for how the network side allocates the D-SR resources to the UE has not been given in the prior art, so the UE cannot obtain the D-SR resources, that is, the network side cannot allocate the D-SR resources to the UE.
Disclosure of Invention
The embodiment of the invention provides a resource allocation method and a resource allocation device, which are used for realizing that a network side allocates D-SR resources for UE.
The resource allocation method provided by the embodiment of the invention comprises the following steps:
determining User Equipment (UE) to be allocated with a dedicated scheduling request (D-SR) resource;
determining a D-SR resource allocation priority queue formed by the UE according to a preset priority sequence;
allocating pre-configured D-SR resources to the UE in the D-SR resource allocation priority queue according to the priority sequence;
the base station provided by the embodiment of the invention comprises:
a determining unit, configured to determine a user equipment UE to which a dedicated scheduling request D-SR resource is to be allocated;
a queuing unit, configured to determine, according to a preset priority order, a D-SR resource allocation priority queue formed by the UE;
and the D-SR resource allocation unit is used for allocating the pre-configured D-SR resources to the UE in the D-SR resource allocation priority queue according to the priority sequence.
In the embodiment of the invention, the user equipment UE to be allocated with the special scheduling request D-SR resource is determined; determining a D-SR resource allocation priority queue formed by the UE according to a preset priority sequence; and allocating the pre-configured D-SR resources to the UE in the D-SR resource allocation priority queue according to the priority sequence, so that the network side can realize the allocation of the D-SR resources to the UE.
Drawings
Fig. 1 is a schematic structural diagram of a communication system according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a base station according to an embodiment of the present invention;
fig. 3 is a flowchart illustrating a resource allocation method according to an embodiment of the present invention.
Detailed Description
The embodiment of the invention provides a resource allocation method and a resource allocation device, which are used for realizing that a network side allocates D-SR resources to UE.
The embodiment of the invention considers that an LTE system needs to support more UEs, the system load needs to be considered when selecting the UE to be allocated with the D-SR resources, if the system load is lighter, the D-SR resources can be allocated to the UE in the connection state and the synchronization state, and if the system load is heavier, only the UE in the connection state, the synchronization state and the non-long DRX (long DRX) state is considered. Wherein, a UE in a non-long DRX state is a UE which is not configured with DRX or is in a short DRX (short DRX) state.
The technical solution provided by the embodiment of the present invention is explained below with reference to the accompanying drawings.
Referring to fig. 1, a communication system provided in an embodiment of the present invention includes: a base station 11 and at least one user equipment UE 12.
And the base station 11 is used for allocating D-SR resources for the UE 12.
And the UE12 is configured to send the SR request to the base station 11 by using the D-SR resource allocated by the base station 11.
Preferably, referring to fig. 2, the base station 11 provided in the embodiment of the present invention includes:
a determining unit 111, configured to determine a user equipment UE12 to be allocated with dedicated scheduling request D-SR resources.
A queuing unit 112, configured to determine a D-SR resource allocation priority queue Q formed by the UE12 according to a preset priority order.
And the D-SR resource allocation unit 113 is configured to allocate the preconfigured D-SR resources to the UEs 12 in the D-SR resource allocation priority queue Q according to the priority order.
The priority order is:
the UE12 requests the priority attribute values of labels (labels) corresponding to Radio Bearers (RBs) of the D-SR resources in the descending order; or,
the UE12 requests the attribute values of packet loss rate budgets (PDBs) of labels (labels) corresponding to radio bearers of the D-SR resources in a descending order; or,
the UE12 requests a chronological order of radio bearer establishment for the D-SR resources.
Preferably, the D-SR resource allocating unit 113 allocates the D-SR resources in each uplink conventional subframe to the UE12 in the D-SR resource allocation priority queue Q in sequence according to the time sequence and the priority sequence of all uplink conventional subframes in the SR period.
Specifically, the D-SR resource allocating unit 113 sorts all uplink conventional subframes in one SR period according to the time sequence according to the SR period, and allocates D-SR resources in the uplink conventional subframes to the UE in sequence from high to low according to the priority of the UE in the SR resource allocation priority queue, and when the D-SR resource of one uplink conventional subframe is used up, continues to allocate the D-SR resource of the next uplink conventional subframe until the D-SR resources of all UEs in the queue Q have been allocated up, or until the D-SR resources of all uplink conventional subframes in one SR period have been allocated up. The higher the priority, the earlier the time corresponding to the D-SR resource obtained by the UE.
Preferably, the queuing unit 112 includes:
a first queuing unit 21, configured to determine, according to a preset priority order, a D-SR resource allocation priority queue formed by the UE 12.
And the second queuing unit 22 is configured to, after the D-SR resources in all uplink conventional subframes in the SR period are allocated, add the UE12 that is not allocated with the D-SR resources in the D-SR resource allocation priority queue Q and the UE12 that satisfies the preset allocation condition but does not obtain the D-SR resources into the unallocated D-SR resource queue QW according to the preset priority order.
Wherein, the UE meeting the preset allocation condition, for example: a UE in a synchronized state; or, a UE in a synchronized state and in a non-long DRX state.
Preferably, the determining unit 111 determines the UE12 in the synchronization state as the UE12 to be allocated with the D-SR resource when the system load is smaller than a preset threshold; or when the system load is greater than the preset threshold value, determining the UE12 in the synchronization state and in the non-long DRX state as the UE12 to be allocated with the D-SR resources.
And a D-SR resource allocation unit 113, configured to release the D-SR resource of the UE when the UE allocated to the D-SR resource enters the out-of-synchronization state or the long DRX state, and acquire the UE with the highest priority from the queue QW according to a preset priority order, and allocate the D-SR resource to the UE.
Before allocating the D-SR resources to the UE, the base station needs to configure the D-SR resources first, that is, determine the amount of the D-SR resources, and a specific scheme for how to configure the D-SR resources in the embodiment of the present invention is described below.
The system reserves a part of PUCCH resources as dedicated scheduling request resources of the cell, namely D-SR resources, and the resource size can be broadcasted and notified to each UE in the cell through broadcast messages. The embodiment of the invention provides a semi-static configuration scheme aiming at D-SR resources, and realizes the determination of the D-SR resource quantity of a cell from the reserved PUCCH resources, namely the determination of the number of D-SRs of UE which can be borne by the PUCCH in each uplink conventional subframe of each SR period.
Since the D-SR resource belongs to the cell-level D-SR resource, configuring the D-SR resource in the embodiment of the present invention actually determines the amount of the D-SR resource of the cell.
In the embodiment of the invention, the configuration principle of the cell-level D-SR resources is to reduce the occupation of PUCCH resources as much as possible under the condition of ensuring that the D-SR resources meet the requirements of UE in a cell.
The configuration of the cell-level D-SR resource mainly considers configuration information of Uplink (UL)/uplink (DL) of a cell, an SR period, the number of UEs in a synchronized state in the cell, and further may consider an activation degree of each UE service.
The activation degree of the UE service can be distinguished by the DRX state, and for the UE in the long DRX state, the activation degree may be considered to be not high, and the configuration of the D-SR resource for the UE may not be considered.
That is, in the embodiment of the present invention, the UE in the in-synchronization non-long DRX state in the cell is mainly considered, and the UE in the out-of-synchronization state and the long DRX state are not considered.
In the embodiment of the invention, the configuration of the cell D-SR resources adopts a semi-static configuration mode, and the semi-static configuration process comprises a pre-configuration process and a dynamic adjustment process. A pre-configuration process, which mainly completes the initial configuration of the cell D-SR resources; and (3) a dynamic adjustment process, namely adjusting the size or the period of the cell D-SR resource according to the system load condition so as to improve the utilization rate of the PUCCH resource.
A detailed description of the pre-configuration process and the dynamic adjustment process is given below.
The pre-configuration process of the cell-level D-SR resource comprises the following steps:
the method comprises the following steps: determining the number of UEs, user _ per _ PRB, which can be carried by one PRB according to the cyclic shift interval deltashift of the cyclic shift sequence selected by the RRC:
usernum_per_PRB＝cycshiftseq_len/deltashift*oth_num
wherein,
cycshiftseq _ len is the length of the cyclic shift sequence, and for the PUCCH channel, cycshiftseq _ len is 12.
deltashift is the cyclic shift interval of the cyclically shifted sequence, and may have a value of: 1. 2 or 3, in general, deltashift is 2, and if the number of UEs is large, deltashift may be 1, that is, the larger the number of UEs, the smaller the value of deltashift.
oth _ num is the number of orthogonal sequences, and for the PUCCH (1) channel, i.e. the PUCCH channel of format1, oth _ num is 3.
Different UEs carried on the same PRB are distinguished through different cyclic shift values.
Step two: according to the configuration information of UL/DL, the number M of uplink normal subframes in a radio frame (radio frame) with the length of 10 milliseconds (ms) is determined.
Currently, in the LTE system, there are several UL/DL configurations as shown in the following table:
watch 1
Where 0 to 9 represents the subframe number, D represents the downlink time slot, S represents the special time slot, and U represents the uplink time slot.
Step three: counting the number of the UEs in a non-long DRX state, which are in a synchronous state and establish Radio Bearers (RBs) in all uplink conventional subframes in a preset time period T by the system, and averaging all the uplink conventional subframes in the time period T to obtain the average number UE _ NUM _ AVG of the UEs in the synchronous non-long DRX state in each uplink conventional subframe.
Step four: and selecting a proper SR PERIOD PERIOD from a plurality of preset SR PERIODs according to the UE _ NUM _ AVG and the number M of the uplink conventional subframes in the radio frame determined in the step two.
The SR periods supported at present are divided into five types of 5ms, 10ms, 20ms, 40ms and 80 ms. Selecting a suitable SR PERIOD from a plurality of preset SR PERIODs means determining one SR PERIOD from the plurality of preset SR PERIODs as the currently used SR PERIOD according to the system load. For example: if the system load is heavy and the number of the uplink normal subframes in each raido frame is small, a relatively long SR period can be selected, otherwise, a relatively short SR period can be selected.
The system load may be the number of UEs accessed by the current system. For example, when the number of UEs accessed by the system exceeds a preset threshold and the number of uplink normal subframes in each radio frame is less than a certain value, 40ms may be selected as the currently adopted SR PERIOD.
Of course, according to actual needs, different threshold values may be preset for the system load, and different SR periods may be determined.
Step five: determining the number NUM of the regular subframes in one SR period, and calculating the D-SR resource configured for the UE in each subframe according to NUM, the number usernum _ per _ PRB of the UE which can be supported by each PRB and the average value UE _ NUM _ AVG of the number of the UE which needs to be supported by each uplink regular subframe, namely determining the SR of how many UEs in the cell can be carried by each uplink regular subframe in each SR period in the current PUCCH channel resource, if N is usedPUCCH(1)，SRRepresenting the number of UEs that can be carried by each uplink normal subframe of each SR period in the current PUCCH channel resource, then:
wherein ceil represents rounding up.
Of course, as can be seen from the above equation, N can be obtained by directly using two parameters, UE _ NUM _ AVG and NUM, instead of using the usernum _ per _ PRB parameterPUCCH(1)，SRIn (1).
NPUCCH(1)，SRI.e. the amount of D-SR resources per uplink regular subframe per SR period.
The dynamic adjustment process of the D-SR resource comprises the following steps:
since the cell level parameters are transmitted through the broadcast message and are not suitable for frequent change, an adjustment strategy of a periodic or fixed time period may be adopted, that is, the dynamic adjustment process of the D-SR resource may be performed according to a preset period, a cycle, or a preset time period, which is periodically performed when the time period comes. The specific scheme is as follows:
step A: the execution cycle of dynamic adjustment is preset, for example, the D-SR resource in the time period T (T may be in units of several hours) is dynamically adjusted every several days.
And B: and counting the D-SR resources (a first part of D-SR resources) allocated in the last time period T and the D-SR resources (a second part of D-SR resources) required by the UE which meets the allocation condition but does not obtain the D-SR resources last time, and calculating the average value of the first part of D-SR resources and the second part of D-SR resources.
The size of the D-SR resource required by the UE that has satisfied the allocation condition but has not obtained the D-SR resource last time, that is, in the process of allocating the D-SR resource last time, because the cell-specific D-SR resource is limited, not all UEs in the synchronous and non-long DRX state may be allocated to the D-SR resource, and there may be a portion of UEs that have not obtained the D-SR resource, so that currently, in the process of adjusting the D-SR resource, the size of the D-SR resource that needs to be obtained by the portion of UEs needs to be considered.
And C: and D, determining the size of the D-SR resource or the SR cycle in the current time period T by using the average value obtained in the step B.
For example: if the average value counted in the step B is twice of the size of the D-SR resources configured in the current time period T determined in the step C, the SR cycle can be adjusted to be twice of the currently determined SR cycle; or, the SR period determined last time is kept unchanged, and only the SR resource of each uplink regular subframe configured last time is adjusted to be twice as large as the SR resource of each uplink regular subframe currently configured, so that the PUCCH resource can be used more effectively.
To sum up, the method for determining D-SR resources provided by the embodiment of the present invention includes the steps of: and determining the number average value UE _ NUM _ AVG of the UE in the synchronization state in each uplink conventional subframe within a preset time period T. And determining the number NUM of the uplink normal subframes in each SR period according to the configuration information of the uplink or the downlink. And determining the quantity value of the UE which can be carried by the PUCCH in each uplink conventional subframe by utilizing the UE _ NUM _ AVG and the NUM, and taking the value as the value of the D-SR resource quantity in each uplink conventional subframe of each SR period.
Preferably, the method for determining D-SR resources further includes: and determining the number of UE usernum _ per _ PRB which can be carried by each PRB.
Preferably, the value of the amount of D-SR resources in each uplink regular subframe of each SR period is determined using usernum _ per _ PRB, NUM, and UE _ NUM _ AVG.
Referring to fig. 3, a method for allocating D-SR resources provided in an embodiment of the present invention includes:
s101, determining UE to be allocated with D-SR resources.
S102, determining a D-SR resource allocation priority queue formed by the UE according to a preset priority sequence.
S103, allocating the pre-configured D-SR resources to the UE in the D-SR resource allocation priority queue according to a preset priority sequence.
Preferably, step S103 includes:
and sequentially allocating the D-SR resources in each uplink conventional subframe to the UE in the D-SR resource allocation priority queue according to the time sequence of all the uplink conventional subframes in the scheduling request SR period and the preset priority sequence.
Preferably, after the D-SR resources in all uplink normal subframes in the SR period are allocated, the method further includes:
adding UE which is not allocated with the D-SR resources in the D-SR resource allocation priority queue and UE which meets the preset allocation condition but does not obtain the D-SR resources into the D-SR resource allocation-unallocated queue according to the preset priority sequence;
and when the UE which is already allocated with the D-SR resources enters an out-of-step state or a long DRX state, releasing the D-SR resources of the UE, and allocating the D-SR resources to the UE in the D-SR resource queue which is not allocated with the D-SR resources according to a preset priority order.
Preferably, when the UE to be allocated with the D-SR resource is a UE in a synchronous state, the step of determining the UE to be allocated with the D-SR resource includes:
and when the system load is smaller than a preset threshold value, determining the UE in the synchronous state as the UE to be allocated with the D-SR resources.
Preferably, when the UE to be allocated with D-SR resources is a UE in a synchronous state and a non-long DRX state, the step of determining the UE to be allocated with D-SR resources includes:
and when the system load is greater than a preset threshold value, determining the UE in the synchronous state and the non-long DRX state as the UE to be allocated with the D-SR resources.
In summary, the embodiments of the present invention determine the UE to be allocated with the D-SR resource; determining a D-SR resource allocation priority queue formed by the UE according to a preset priority sequence; and allocating the pre-configured D-SR resources to the UE in the D-SR resource allocation priority queue according to the preset priority sequence, so that the network side can realize the allocation of the D-SR resources to different UEs.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (10)
1. A method for resource allocation, the method comprising:
determining User Equipment (UE) to be allocated with a dedicated scheduling request (D-SR) resource;
determining a D-SR resource allocation priority queue formed by the UE according to a preset priority sequence;
and allocating the pre-configured D-SR resources to the UE in the D-SR resource allocation priority queue according to the priority sequence.
2. The method of claim 1, wherein the step of allocating pre-configured D-SR resources to UEs in the D-SR resource allocation priority queue according to the priority order comprises:
and sequentially allocating the D-SR resources in each uplink conventional subframe to the UE in the D-SR resource allocation priority queue according to the time sequence of all the uplink conventional subframes in the scheduling request SR period and the priority sequence.
3. The method according to claim 1 or 2, wherein when the D-SR resources in all uplink normal subframes in the scheduling request SR period are allocated, the method further comprises:
adding UE which is not allocated with the D-SR resources in the D-SR resource allocation priority queue and UE which meets a preset allocation condition but does not obtain the D-SR resources into the D-SR resource allocation priority queue according to the priority sequence;
and when the UE which is already allocated with the D-SR resources enters an out-of-synchronization state or a long DRX state, releasing the D-SR resources of the UE, and allocating the D-SR resources to the UE in the unallocated D-SR resource queue according to the priority sequence.
4. The method of claim 1, wherein the priority order is:
the UE requests the priority attribute values of labels corresponding to the radio bearers of the D-SR resources in a descending order; or,
the UE requests the sequence of the PDB attribute values of the packet loss rate budget corresponding to the radio bearer of the D-SR resource from small to large; or,
and the UE requests the time sequence of the radio bearer establishment of the D-SR resources.
5. The method of claim 1, wherein the UE is a UE in a synchronization state;
the step of determining the UE to be allocated with the D-SR resources comprises the following steps:
and when the system load is smaller than a preset threshold value, determining the UE in the synchronous state as the UE to be allocated with the D-SR resources.
6. The method of claim 1, wherein the UE is in a synchronization state and a non-long DRX state;
the step of determining the UE to be allocated with the D-SR resources comprises the following steps:
and when the system load is greater than a preset threshold value, determining the UE in the synchronous state and the non-long DRX state as the UE to be allocated with the D-SR resources.
7. A base station, comprising:
a determining unit, configured to determine a user equipment UE to which a dedicated scheduling request D-SR resource is to be allocated;
a queuing unit, configured to determine, according to a preset priority order, a D-SR resource allocation priority queue formed by the UE;
and the D-SR resource allocation unit is used for allocating the pre-configured D-SR resources to the UE in the D-SR resource allocation priority queue according to the priority sequence.
8. The base station of claim 7, wherein the D-SR resource allocating unit sequentially allocates the D-SR resources in each uplink regular subframe to the UEs in the D-SR resource allocation priority queue according to the time sequence and the priority sequence of all uplink regular subframes in the scheduling request SR period.
9. The base station of claim 8, wherein the queuing unit comprises:
the first queuing unit is used for determining a D-SR resource allocation priority queue formed by the UE according to a preset priority sequence;
the second queuing unit is used for adding the UE which is not allocated with the D-SR resources in the D-SR resource allocation priority queue and the UE which meets the preset allocation condition but does not obtain the D-SR resources into the D-SR resource unallocated queue according to the priority sequence after the D-SR resources in all uplink conventional subframes in the SR cycle are allocated;
and the D-SR resource allocation unit releases the D-SR resources of the UE when the UE allocated with the D-SR resources enters an out-of-step state or a long DRX state, and allocates the D-SR resources to the UE in the D-SR resource queue which is not allocated according to the priority sequence.
10. The base station of claim 7, wherein the determining unit determines the UE in the synchronization state as the UE to be allocated with the D-SR resource when the system load is smaller than a preset threshold; or when the system load is greater than a preset threshold value, determining the UE in the synchronous state and the non-long DRX state as the UE to be allocated with the D-SR resources.
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