WO2013000242A1 - Procédé et dispositif d'allocation de ressources - Google Patents

Procédé et dispositif d'allocation de ressources Download PDF

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Publication number
WO2013000242A1
WO2013000242A1 PCT/CN2011/083463 CN2011083463W WO2013000242A1 WO 2013000242 A1 WO2013000242 A1 WO 2013000242A1 CN 2011083463 W CN2011083463 W CN 2011083463W WO 2013000242 A1 WO2013000242 A1 WO 2013000242A1
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Prior art keywords
user
cell
subordinate
users
scheduling priority
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PCT/CN2011/083463
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English (en)
Chinese (zh)
Inventor
陈宪明
宁迪浩
关艳峰
刘锟
贾晓山
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中兴通讯股份有限公司
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Publication of WO2013000242A1 publication Critical patent/WO2013000242A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/50—Allocation or scheduling criteria for wireless resources
    • H04W72/56—Allocation or scheduling criteria for wireless resources based on priority criteria

Definitions

  • the present invention relates to the field of communications, and in particular to a resource allocation method and apparatus.
  • BACKGROUND With the rapid development of wireless communication technologies, severely insufficient spectrum resources have gradually become a major factor restricting the development of wireless communications. How to make full use of limited spectrum resources and improve spectrum utilization is a major problem in wireless communications.
  • Multiple Input Multiple Out (MIMO) technology is widely used because of its ability to improve transmission efficiency and spectrum utilization without increasing bandwidth.
  • MIMO Multiple Input Multiple Out
  • the traditional MIMO technology cannot effectively solve the inter-cell interference problem, that is, the communication process between the cell edge user and the serving cell will be seriously interfered by the neighboring cell, and cannot satisfy the communication quality requirement of the user.
  • JT Joint transmission
  • data is jointly processed by each collaboration point. That is, each UE's data is jointly transmitted by all collaboration points to improve reception. Quality or transmission rate, and can eliminate interference.
  • JT according to the coherence of the emissions, it is divided into coherent joint and non-coherent joint emissions.
  • the coherent joint transmission may adopt a joint precoding method, including single UE joint transmission and multi UE joint transmission, which has the advantages of high gain, and the disadvantage is that a large amount of downlink channel H feedback information is required, which will occupy too many uplink channels.
  • non-coherent joint transmission is also a robust transmission method. Multiple cooperative points participating in the transmission serve a certain UE, but the transmission weight is formed independently, so the coherent signal cannot be formed at the UE end. However, the power gain can be obtained relatively stably, and feedback channel information is not required. Due to the introduction of the CoMP technology, the resource allocation strategy of the traditional single cell is no longer applicable.
  • the present invention provides a resource allocation method and apparatus to address at least the problem of joint resource allocation based on multi-cell cooperation in the related art.
  • the resource allocation method according to the present invention includes: selecting a coordinated cell for all subordinate users of the base station pool respectively; determining, according to the coordinated cell, scheduling priorities of all subordinate users on the resource block respectively; respectively, assigning resource blocks to the designated subordinate according to the scheduling priority user.
  • the resource blocks are allocated to the designated subordinate users, including: Step 1: Sort all the subordinate users according to the scheduling priority from high to low, and form a queue of the user to be scheduled; Step 2: Obtain a queue of the user to be scheduled The user with the highest scheduling priority and allocates its coordinated cell resource block to the user; Step 3: Update the queue of the user to be scheduled, and continue to perform steps 2 and 3 until all resource blocks of all cells in the base station pool are allocated. , or the queue of users to be scheduled is empty. Updating the queue of the user to be scheduled includes: deleting the user from the queue of the user to be scheduled, wherein the deleted user includes: a scheduled user, a user associated with the coordinated cell of the scheduled user.
  • the method further includes: the single coordinated cell user performs single cell transmission using the resource block of the serving cell; and the multiple coordinated cell user performs multiple resource blocks of the multiple coordinated cell. Joint transmission of cells.
  • the method further includes: pairing the user who allocates the resource block with another user, where the other user should have the same coordinated cell as the user. Selecting a coordinated cell for all subordinate users of the base station pool includes: receiving a received power indication and/or a channel indication from the measured cell to the user from the subordinate user; selecting, for each subordinate user of the base station pool according to the received power indication and/or the channel indication Collaborative community.
  • the method Before receiving the received power indication and/or the channel indication from the measurement cell to the user of the subordinate user, the method further includes: the base station pool all subordinate users measuring the received power indication and/or the channel based on the downlink reference signal transmitted by the measurement cell.
  • the indication where the downlink reference signal includes at least one of the following: a synchronization signal, a cell-specific reference signal, and a channel state indication reference signal.
  • the resource allocation apparatus includes: a selection module, configured to respectively select a coordinated cell for all subordinate users in the base station pool; and a determining module, configured to determine, according to the coordinated cell, a scheduling priority of all subordinate users on the resource block respectively; , set to allocate resource blocks to the specified subordinate users according to the scheduling priority.
  • FIG. 1 is a flowchart of a resource allocation method according to an embodiment of the present invention
  • FIG. 2 is a flowchart of a resource allocation method according to a preferred embodiment of the present invention
  • FIG. 3 is based on the same according to a preferred embodiment of the present invention.
  • FIG. 4 is a schematic diagram of a joint processing based on an extended base station pool (7 sites) according to a preferred embodiment of the present invention
  • FIG. 5 is a resource allocation apparatus according to an embodiment of the present invention
  • the embodiment of the present invention provides a resource allocation method.
  • FIG. 1 is a flowchart of a resource allocation method according to an embodiment of the present invention. As shown in FIG. 1, the following steps S102 to S106 are included.
  • Step S102 Select a coordinated cell for all subordinate users in the base station pool.
  • Step S104 Determine, according to the coordinated cell, a scheduling priority of all subordinate users on the resource block.
  • Step S106 Assign resource blocks to the designated subordinate users according to the scheduling priority.
  • determining the scheduling priority of all subordinate users on the resource block according to the coordinated cell includes: calculating, according to the determined criterion, a scheduling priority metric of each subordinate user, where the determined criterion includes a proportional fairness criterion, and a maximum Carrier-to-interference ratio criteria, polling criteria.
  • calculating the scheduling priority metric values of all the subordinate users respectively according to the determined criterion comprises: combining users feedback data for users having multiple coordinated cells to obtain combined data for calculating a scheduling priority metric value; The scheduling priority metric is calculated using the merged data based on the determined criteria.
  • the feedback data from the user is used as the combined data to calculate the scheduling priority metric.
  • the resource blocks are allocated to the designated subordinate users according to the scheduling priority.
  • Step 1 According to the scheduling priority, the subordinate users are sorted according to the scheduling priority, and the user queues to be scheduled are formed.
  • Step 2 Obtaining Scheduling the user with the highest scheduling priority in the user queue and assigning its coordinated cell resource block to the user.
  • Step 3 Update the queue of the user to be scheduled, and continue to perform steps 2 and 3 until the resource blocks of all cells in the base station pool All are assigned, or the queue of users to be scheduled is empty.
  • updating the queue of the user to be scheduled comprises: deleting the user from the queue of the user to be scheduled, wherein the deleted user comprises: a scheduled user, a user associated with the coordinated cell of the scheduled user.
  • the method further includes: the single coordinated cell user performs single cell transmission using the resource block of the serving cell; and the multiple coordinated cell user uses resources of the multiple coordinated cell.
  • the block performs joint transmission of multiple cells.
  • the method further includes: pairing the user who allocates the resource block with another user, wherein the other user should have the user with the user The same collaborative cell. The preferred embodiment pairs the user with other users to achieve multi-antenna transmission by multiple users.
  • selecting a coordinated cell for all subordinate users of the base station pool includes: receiving a received power indication and/or a channel indication from the measurement cell to the user from the subordinate user; and determining, according to the received power indication and/or the channel indication, the base station pool Subordinate users select a collaborative cell.
  • the method before receiving the received power indication and/or the channel indication from the measurement cell to the user of the subordinate user, the method further includes: the base station pool all the subordinate users measuring the received power indication based on the downlink reference signal transmitted by the measurement cell and And/or channel indication, wherein the downlink reference signal comprises at least one of the following: a synchronization signal, a cell-specific reference signal, and a channel state indication reference signal.
  • Step S202 The base station pool selects a coordinated cell for all subordinate users. Preferably, the base station pool notifies all the subordinate users to measure the received power indication and the channel indication of the measured cell to the user, and feeds back to the base station pool through the uplink, where the user's measured cell set includes the base station All or part of the subordinate cell of the pool.
  • the base station pool selects a coordinated cell for the user based on the received power indication and/or channel indication of the measurement cell to the user fed back by the user.
  • the received power indication includes an average received power indication and an instantaneous received power indication.
  • the coordinated cell set of the user is included in the measured cell set of the user.
  • all subordinate users of the base station pool measure the received power indication and/or channel indication based on the downlink reference signal transmitted by the measurement cell.
  • the downlink reference signal includes, but is not limited to, a synchronization signal, a cell-specific reference signal, and a channel state indication reference signal.
  • the channel indication includes, but is not limited to, a rank indication (RI), a precoding indication (PMI), and a channel quality indicator (CQI) of the channel.
  • the coordinated cell set includes a serving cell.
  • the base station pool refers to a set of base stations capable of joint processing through a dedicated interface (for example, an X2 interface between base stations) or a backplane.
  • the set of coordinated cells is based on a specific (long-term or short-term) periodic update. Step S204, selecting an allocable resource block, all users sorting the current resource blocks according to a scheduling priority from high to low, and forming a queue of users to be scheduled.
  • the calculation criteria of the scheduling priority metric include, but are not limited to, a proportional fair (PF) criterion, a maximum carrier-to-interference ratio (Max C/I) criterion, and a polling (RR) criterion.
  • PF proportional fair
  • Max C/I maximum carrier-to-interference ratio
  • RR polling
  • the current actual transmission rate of the user is calculated according to the channel indication between the user and the cooperating cell fed back by the user according to the multi-antenna transmission mode of the single user.
  • Step S206 Find the user with the highest scheduling priority, that is, the first bit in the queue to be scheduled, and allocate the current resource block of the coordinated cell to the user for single cell transmission or joint transmission of multiple cells.
  • the coordinated cell set of the user includes only the serving cell, the current resource block of the serving cell is allocated to the user, and single cell transmission is performed, and if the coordinated cell set of the user includes multiple cells, The current resource blocks of the plurality of cooperating cells are allocated to the user, and joint transmission of the multi-cell is performed.
  • the scheduling user can pair with other users of the same type and satisfying spatial isolation to implement multi-antenna multi-antenna transmission (MU-MIMO), wherein the same-type users refer to a class with the same coordinated cell set. user.
  • Step S208 updating the queue of users to be scheduled.
  • the resource allocation method provided by the present invention is based on the consideration of scheduling the user cooperation set to be completely matched, so as to solve the problem that the possible cooperation sets between the scheduled users in the existing solution are not completely matched.
  • 3 is a schematic diagram of joint processing based on the same site (Site) in accordance with a preferred embodiment of the present invention.
  • the base station pool in the preferred embodiment is composed of three cells (Cells) under the same site, and is represented as Cell 1 (Celll), Cell 2 (Cell 2), and Cell 3 (Cell 3), respectively, through the back between the baseband processing units.
  • the boards are connected to achieve various data information sharing.
  • Step 1 The site selects a coordinated cell set for the user (UE1 to UE9). Specifically, the site notifies UE1 to UE9 to measure the average or instantaneous received power indication and channel indication of Cell1 to Cell3 to the UE, respectively, and feeds back to the site through the uplink, where UE1 to UE9 are at this time.
  • the measurement cell set is the same, that is, includes all the subordinate cells of the site.
  • the average received power indication is generally determined by a large-scale parameter such as path loss, shadow fading, and antenna gain, and the instantaneous received power indication is jointly determined by the above-mentioned large-scale parameter and small-scale parameters such as fast fading.
  • UE1 to UE9 measure a received power indication and a channel indication based on a downlink synchronization signal (SS) and a channel state indication reference signal (CSI-RS) of Celll to Cell3, wherein the channel indication includes a rank indication (RI), a precoding indication (PMI) and Channel Quality Indicator (CQI) information.
  • the Cell11 to Cell3 includes a serving cell of any UE.
  • the site compares the received power of the serving cell of the arbitrary UE to the UE and the received power indication of the other cell in the measurement set to the UE. For example, taking UE1 as an example, if its serving cell is Celll, UE1 measures other cells in the set as Cell2 and Cell3. Specifically, the site obtains the received power indication P from Celll to UE1, and the received power indications P 2 and P 3 of Cell 2 and Cell 3 to UE 1 respectively, and then makes
  • V" 2 is compared with a predetermined threshold ( ⁇ ), and if ⁇ and / or 2 is greater than Q, the corresponding Cell2 and/or Cell3 are used as the coordinated cell of UE1.
  • ⁇ a predetermined threshold
  • the coordinated cell set of any UE It is not statically configured, or is completely unchanged, that is, the coordinated cell set of any UE can perform long-term or short-term semi-static adjustment based on the feedback period of the UE.
  • the coordinated cell of UE1 to UE9 The set is shown in Table 1.
  • Table 1 Cooperative cell set of any UE
  • the user classes with the same coordinated cell are shown in Table 2. It should be noted that although UE3 and UE5 have the same coordinated cell (Cell2 and Cell3), their serving cells are respectively Cell3 and Cell2, that is, they may have different serving cells; and UE6 and UE9 have the same serving cell. , that is, Cell3. Table 2 UEs of the same coordinated cell set
  • Step 2 Select the A-sub-band resource that can be allocated.
  • the sub-bands of the sub-bands are sorted according to the scheduling priority of the highest-to-lower sub-bands, and form a queue of the user to be scheduled.
  • the scheduling priority metric is The calculation criteria are based on the Proportional Fairness (PF) criterion, as shown in the following equation:
  • ubbandA if the first UE is scheduled, its current transmission rate or throughput, ⁇ 7 (3 ⁇ 4) indicates the historical average of the /UE in the scheduling window N (using the number of subbands) for SubbandA: Throughput.
  • the current actual transmission rate of UE1 to UE9 is calculated according to the SU-MIMO transmission mode based on the channel indication between the user and its coordinated cell fed back by any UE.
  • the site obtains a channel indication between UE3 and Cell2 based on feedback of UE3, including rank indication UU 23 , precoding indication PMI 2, and channel quality indicator CQI 23 , Similarly, to obtain channel indication between UE3 and Cell3, comprising a rank indicator (RI 3, precoding matrix indicator PMI 33 and the channel quality indication CQI 33. At this time, assuming combined rank UE3, C3 ⁇ 4) the channel quality CQI ⁇ the following formula .
  • the calculation of the rank and/or channel quality of any UE combining is not limited to the above method.
  • the other methods include: Step 1: Obtain a signal-to-interference plus noise ratio based on CQI 23 and CQI 33 , that is, SINR 23 and SINR 33 ; Step 2, calculate a combined signal and interference plus noise ratio of the UE3 based on the following formula: 57N: Step 3: Obtain a combined channel quality CQI 3 of UE3 based on SINR 3 .
  • the actual transmission rate of UE3 in SubbandA can be expressed as
  • R 3 (S b k ) CarNum .
  • LayNum where CwNum represents the number of transmitted codewords and is not greater than the rank indication (R/j), and CarNum represents the number of data subcarriers available in the kth subband resource (SubbandA), Ja_yM represents the number of transmission layers corresponding to the first codeword, and indicates the transmission efficiency of the modulation coding scheme (MCS) used by the i-th codeword, that is, the effective number of bits per symbol transmission, and the CQI 3 information is indicated by the combined channel quality of the UE3.
  • MCS modulation coding scheme
  • Equation 1 and Equation 2 respectively represent the historical average throughput of SubbandA in the case where the Subband is not scheduled and has been scheduled.
  • ⁇ 3 ( ) is usually preset to a non-zero determined value. Therefore, the scheduling metric (Metric3) of UE3 can be obtained.
  • the scheduling priority metrics (Metric 1 to Metric9) of any UE (UE1 to UE9) can be obtained. The larger the scheduling metric value, the higher the scheduling priority of the corresponding UE.
  • the queue to be scheduled consisting of high to low scheduling priorities is
  • the calculation criterion of the UE scheduling priority metric value further includes, and is not limited to, a maximum carrier-to-interference ratio (Max C/I) criterion or a polling (RR) criterion.
  • Step 3 Find the user with the highest scheduling priority among the queues to be scheduled (UE1 to UE9), and allocate the kth subband resource of the coordinated cell to the user for single cell transmission or joint transmission of multiple cells.
  • the UE3 is the UE with the highest scheduling priority in the queue of the UE to be scheduled, and the cooperation cell of the UE3 is the Cell3 and the Cell2, that is, the coordinated cell set of the UE3 includes two cells.
  • the kth subband resource of Cell3 and Cell2 is allocated to UE3, and joint transmission under two base stations is performed.
  • the coordinated cell set of UE3 includes only its serving cell Cell3, only the kth subband resource of Cell3 is allocated to UE3, and single cell transmission is performed.
  • the scheduled UE UE3 can also be paired with other UEs of the same kind and satisfying spatial isolation to achieve multi-user multi-antenna transmission (MU-MIMO).
  • MU-MIMO multi-user multi-antenna transmission
  • the user of the same type of UE3 is a user who has the same coordinated cell as UE3. As shown in Table 2, UE2 and UE3 have the same coordinated cell. Second, it is necessary to determine whether the spatial isolation of UE3 and UE2 meets the requirements. Specifically, based on feedback of UE3 and UE2, the Site can obtain a combined precoding matrix of UE3 and UE2.
  • PML 33 PM 32 Preferably, the following projection 2 norm distance is used, but is not limited to the distance formula to calculate the spatial distance between 3 ⁇ 4 and 3 ⁇ 43 ⁇ 4:
  • 11 is the matrix 2 norm and H is the conjugate transpose operation of the matrix t
  • the predetermined threshold for example, /3 ⁇ 4
  • obtain the condition number of the matrix [PM7 3 7 2 ] that is, determine the ratio of the maximum singular value of the matrix to the minimum singular value, and if the condition number does not exceed a predetermined threshold (for example, 3), it can also represent UE3 and UE2.
  • a predetermined threshold for example, 3
  • the channel quality indicates CQI, which is capable of predicting the rank (RI MU ) precoding PMI MU currently applicable to multi-user (UE3 and UE2) transmissions and the channel quality CQI MU of multiple users.
  • CQI rank indication
  • Step 4 Update the queues to be scheduled (UE1 to UE9). Specifically, the following users are deleted from the user queues to be scheduled ⁇ UE3, UE6, UE4, UE1, UE2, UE7, UE9, UE5, UE8 ⁇ : 1) the scheduled user, that is, UE3;
  • Step 6 For the k+1th sub-band resource, return to perform step 2 to step 5 until the allocation of all sub-band resources is completed.
  • the updated queue of the to-be-scheduled users is always empty, and there are always central users of some cells, so that all the sub-band resources are allocated. At this time, a larger scheduling gain can be obtained.
  • MCS modulation and coding scheme
  • FIG. 4 is a schematic diagram of joint transmission based on an extended base station pool (7 sites) according to a preferred embodiment of the present invention. As shown in FIG. 4, three base stations (9 cells) constitute a base station pool, different The low-latency communication between the sites is performed through a dedicated interface (for example, the ⁇ 2 interface in the LTE system). At this time, the measurement cell set and the coordinated cell set of any UE are not limited to the same site, and different UEs may have different measurement cell sets.
  • the measurement cell set of the UE 25 is ⁇ Celll, Cell6, Cell7 ⁇ , and its coordinated cell (including the serving cell) is included in the set
  • the measurement cell set of the UE 26 is ⁇ Celll, Cell6, Cell8 ⁇ , and its coordinated cell includes
  • UE 25 and UE 26 have different sets of measurement cells and/or sets of coordinated cells. Based on the feedback of any UE and the coordinated cell set, the resource allocation process of each sub-band resource of the base station pool composed of multiple sites is consistent with the resource allocation process described in the preferred embodiment of the single site described above.
  • FIG. 5 is a structural block diagram of a resource allocation apparatus according to an embodiment of the present invention. As shown in FIG. 5, a selection module 52, a determination module 54, and an allocation module 56 are included. The structure is described in detail below.
  • the selecting module 52 is configured to respectively select a coordinated cell for all subordinate users in the base station pool; the determining module 54 is connected to the selecting module 52, and is configured to determine, according to the coordinated cell selected by the selecting module 52, the scheduling priority of all subordinate users on the resource block respectively.
  • the allocation module 56 is coupled to the determining module 54 and configured to allocate resource blocks to the designated subordinate users in accordance with the scheduling priorities determined by the determining module 54.
  • the invention solves the problem that how to implement the joint resource allocation based on multi-cell cooperation has no good solution in the related art according to the joint processing of the scheduling priorities of multiple users, and ensures that the overall spectrum efficiency of the cell is not reduced. Or throughput, while improving cell edge coverage.
  • modules or steps of the present invention can be implemented by a general-purpose computing device, which can be concentrated on a single computing device or distributed over a network composed of multiple computing devices.
  • they may be implemented by program code executable by the computing device, such that they may be stored in the storage device by the computing device, or they may be separately fabricated into individual integrated circuit modules, or they may be Multiple modules or steps are made into a single integrated circuit module.

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  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

La présente invention se rapporte à un procédé et à un dispositif d'allocation de ressources. Le procédé consiste à sélectionner respectivement une cellule coordonnée pour tous les utilisateurs subordonnés d'un groupe de stations de base ; déterminer respectivement les priorités de planification de tous les utilisateurs subordonnés sur un bloc de ressources ; et allouer un bloc de ressources à un utilisateur subordonné désigné selon la priorité de planification. La présente invention résout le problème de l'état de la technique selon lequel il n'existe toujours pas une bonne solution en ce qui concerne la manière d'obtenir une allocation de ressources commune sur la base d'une coordination de multiples cellules, et assure l'amélioration de la couverture de bord de cellule tout en ne réduisant pas le rendement spectral global ou le rendement global de la cellule.
PCT/CN2011/083463 2011-06-29 2011-12-05 Procédé et dispositif d'allocation de ressources WO2013000242A1 (fr)

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CN111357348B (zh) * 2017-12-27 2022-03-29 华为技术有限公司 调度方法、装置和系统
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