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WO2012119519A1 - Procédé et appareil de multiplexage spatial, et système d'attribution d'intervalles de temps de transmission à une liaison de communication - Google Patents

Procédé et appareil de multiplexage spatial, et système d'attribution d'intervalles de temps de transmission à une liaison de communication Download PDF

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Publication number
WO2012119519A1
WO2012119519A1 PCT/CN2012/071734 CN2012071734W WO2012119519A1 WO 2012119519 A1 WO2012119519 A1 WO 2012119519A1 CN 2012071734 W CN2012071734 W CN 2012071734W WO 2012119519 A1 WO2012119519 A1 WO 2012119519A1
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WIPO (PCT)
Prior art keywords
link
receiving end
ith
transmission
receiving
Prior art date
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Ceased
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PCT/CN2012/071734
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English (en)
Chinese (zh)
Inventor
刘培
邹卫霞
胡玉聪
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Huawei Technologies Co Ltd
Beijing University of Posts and Telecommunications
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Huawei Technologies Co Ltd
Beijing University of Posts and Telecommunications
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Publication of WO2012119519A1 publication Critical patent/WO2012119519A1/fr
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/04—Wireless resource allocation
    • H04W72/044—Wireless resource allocation based on the type of the allocated resource
    • H04W72/0446—Resources in time domain, e.g. slots or frames

Definitions

  • the present invention relates to the field of wireless communications, and in particular, to a method, apparatus and system for spatial multiplexing of transmission time slots for a communication link. Background technique
  • Multi-beam smart antenna beamforming is a practical technology that is the most competitive in achieving digital Gbps transmission in recent years.
  • the smart antenna is composed of a plurality of antenna array elements arranged according to a certain layout. Each antenna array element is followed by a weighting device, usually a complex number, which adjusts the phase and adjusts the amplitude, and finally combines with the adder to realize the directivity of the signal. Send and receive.
  • the smart antenna uses SDMA (Space Division Multiple Access) technology to distinguish signals of the same frequency and the same gap by using the difference in the direction of signal propagation. It can multiply the communication capacity and combine it with other technologies to maximize the use of limited spectrum resources. Moreover, it can effectively solve delay spread, Rayleigh fading, multipath, co-channel interference, etc. in mobile communications.
  • SDMA Space Division Multiple Access
  • the 60 GHz wireless communication with several Gbps transmission rate has a large amount of traffic, good directionality, strong security and confidentiality, and high transmission quality.
  • the absolute advantages of versatility and license-free features stand out, while the 60 GHz is in the field of millimeter-wave communication, and the antenna size is small, making it possible to use smart antennas for small devices.
  • the smart antenna is composed of multiple antenna elements, and the existing beam training method is easy to generate errors and takes a long time, the smart antenna beamforming has certain limitations in terms of cost and time complexity, and is intelligent.
  • the antenna has certain difficulties in the technology and chip design of the device process production. Therefore, the prior art proposes a spatial multiplexing scheme based on an ER (Exclusive Region) algorithm to achieve an increase in network capacity.
  • the main idea of this scheme is to make a reasonable zero-value approximation for the classical Shannon formula channel capacity based on the wide bandwidth of UWB communication, and then compare TDMA (Time Division Multiple Access) and CDMA (Code Division Multiple Access).
  • the channel capacity formula of the multiplexing mode gives a sufficient condition for improving the channel capacity: the power spectrum of the intersymbol interference is smaller than the power spectrum of the background noise.
  • the ER of a certain link can be derived.
  • the scheme adopts the same transmit power for all links, and an ER area is set at the receiving end of all links according to the device distribution and distance of the entire network, so that there should be no interference source in the area, that is, there is no other link.
  • the transmitting end can allocate links that satisfy each other to the ER condition to the same time slot, thereby improving the throughput of the overall system.
  • the inventor has found that the above-mentioned spatial multiplexing scheme based on the ER algorithm has at least the following disadvantages:
  • the ER radius is a fixed value, and there is a problem that the time slot cannot be fully utilized in the time slot allocation, and the spatial multiplexing efficiency is low. Summary of the invention
  • embodiments of the present invention provide a method, apparatus, and system for spatial multiplexing of transmission time slots for a communication link.
  • the technical solution is as follows: A method for allocating spatial multiplexing of transmission time slots for a communication link, the method comprising: In the unprocessed links of the multiple links, randomly select an ith link with the smallest number of allocated time slots;
  • Processing the ith link includes:
  • the transmitting end of any link in the current time slot is located outside the dedicated area ER of the receiving end of the ith link, and the ith link The transmitting end is also located outside the ER of the receiving end of any of the current time slots; wherein the radius of the ER of the receiving end of the i-th link is the receiving end of the i-th link according to the The communication distance between the transmitting end and the receiving end of the i link is calculated;
  • the current time slot is allocated to the ith link, and the number of time slots allocated by the ith link is updated.
  • An apparatus for spatially multiplexing a transmission time slot for a communication link comprising: a first processing module, configured to randomly select an allocated one of unprocessed links in the plurality of links The ith link with the smallest number of slots;
  • the second processing module is configured to process the ith link, including:
  • the transmitting end of any link in the current time slot is located outside the dedicated area ER of the receiving end of the ith link, and the ith link The transmitting end is also located outside the ER of the receiving end of any of the current time slots; wherein the radius of the ER of the receiving end of the i-th link is the receiving end of the i-th link according to the The communication distance between the transmitting end and the receiving end of the i link is calculated;
  • the current time slot is allocated to the ith link, and the number of time slots allocated by the ith link is updated.
  • a system for spatially multiplexing transmission slots for a communication link comprising: a sending end and a receiving end, and the device; the plurality of transmitting ends and the receiving end form N links; the plurality of receiving ends include the receiving end of the ith link, The transmitting end includes the transmitting end of the i-th link; the receiving end of the i-th link is configured to calculate the self according to the communication distance between the transmitting end and the receiving end of the i-th link The radius of the exclusive area ER, and the radius of the ER is sent.
  • the technical solution provided by the embodiment of the present invention has the beneficial effects of: determining whether to allocate the current time slot to the link according to the transmission condition determined by the ER radius, ensuring that the current time slot is allocated to the link that meets the transmission condition, and the ER radius is according to the communication distance. Therefore, the problem that the time slot cannot be fully utilized in the time slot allocation is solved, the time slot utilization rate and the efficiency of spatial multiplexing are improved, and the system capacity is also improved.
  • FIG. 1 is a flowchart of a method for allocating spatial multiplexing of transmission time slots for a communication link according to Embodiment 1 of the present invention
  • FIG. 2 is a spatial multiplexing method for allocating transmission time slots for a communication link according to Embodiment 2 of the present invention
  • FIG. 3 is a structural diagram of a device for spatial multiplexing of transmission slots allocated for a communication link according to Embodiment 3 of the present invention
  • FIG. 4 is a schematic diagram of allocating transmission slots for a communication link according to Embodiment 4 of the present invention
  • FIG. 5 is a schematic diagram of distributed network simulation provided by an embodiment of the present invention
  • FIG. 6 is a schematic diagram of centralized network simulation provided by an embodiment of the present invention
  • Schematic diagram of the effect on channel capacity detailed description The embodiments of the present invention will be further described in detail below with reference to the accompanying drawings.
  • this embodiment provides a method for allocating spatial multiplexing of transmission time slots for a communication link, including:
  • Processing the i-th link including:
  • the transmitting end of any link in the current time slot is located outside the ER of the receiving end of the i-th link, and the transmitting end of the i-th link is also located in the current time slot.
  • the ER of the receiving end of any link is outside; wherein, the radius of the ER of the receiving end of the i-th link is calculated by the receiving end of the i-th link according to the communication distance between the transmitting end and the receiving end of the i-th link Out
  • the current time slot is allocated to the i-th link, and the number of time slots allocated by the i-th link is updated.
  • the foregoing method may further include: randomly selecting, in all links, a first link with the smallest number of allocated time slots, assigning the current time slot to the first link, and updating the first link.
  • the number of time slots allocated for a link, the current time slot at this time may be unused by any link.
  • step 102 the foregoing method further includes:
  • the foregoing method may further include:
  • the transmitting end of the i th link transmits the ER-RTS ( Exclusive Region-Request to Send) frame at the first transmit power; after the receiving end of the i th link receives the ER-RTS frame, according to the receiving
  • the power and the first transmit power calculate the communication distance between the transmitting end and the receiving end of the i-th link; the receiving end of the i-th link is calculated according to the communication distance and the receiver sensitivity of the receiving end of the i-th link a second transmit power, calculating a radius of the ER of the receiving end of the i-th link according to the second transmit power and the communication distance, and returning an ER-CTS carrying at least a second transmit power and a radius of the ER (Exclusive Region-Clear to Send , the exclusive area allows sending) frames.
  • the i may be a positive integer.
  • the foregoing method may further include:
  • the receiving end of the changed link sends a TPC request frame (Transmit Power Control Request Frame), requesting to adjust the transmit power; after receiving the TPC request frame, the transmitting end of the changed link returns
  • the TPC carrying at least the third transmit power or power adjustment information is a Transmit Power Control Report Frame.
  • the foregoing method provided by this embodiment may be specifically implemented by a PCP (PBSS Central Point) to complete time slot allocation for a link.
  • PBSS Central Point PBSS Central Point
  • Any one of the links in the embodiment may be a STA (station, a common station).
  • the transmitting end of a link is integrated into one STA, and the receiving end of the link is integrated into another STA.
  • the STA is integrated with the transmitting end and the receiving end.
  • the foregoing method provided in this embodiment determines whether to allocate a current time slot to a link according to a transmission condition determined by an ER radius, and ensures that a current time slot is allocated to a link that meets a transmission condition, and the ER radius is determined according to the communication distance, and is not fixed. Value, thus solving the problem that the time slot cannot be fully utilized when the time slot is allocated, The slot utilization and the efficiency of spatial multiplexing are improved, and the system capacity is also increased.
  • Embodiment 2 provides a method for allocating a spatial multiplexing of transmission time slots for a communication link, and taking a time slot allocation of N links by a PCP as an example, where N is a natural number.
  • the method specifically includes:
  • the transmitting end of the i th link transmits the ER-RTS frame at the first transmit power.
  • the ER-RTS frame is used for the first communication between the transmitting end and the receiving end, and the first transmitting power is a fixed transmitting power, which is usually a preset value of the transmitting end and the receiving end. Since the receiving end is to calculate after receiving the ER-RTS frame, the value of the Duration field in the ER-RTS frame can be set to be transmitted.
  • the receiving end of the i th link calculates the communication distance d t between the transmitting end and the receiving end of the i th link according to the received power and the first transmit power '). According to the transmission loss in free space, the transmission power, reception power and communication distance of the signal have the following relationship:
  • the antenna gain at the receiving end, 1 4 ⁇ is a constant, "is the link attenuation coefficient. Therefore, the known first transmitting power of the transmitting end ( 0 , the receiving power measured at the receiving end, and the various constants are substituted into the formula (1), Calculate the communication between the sender and the receiver of the i-th link Letter distance (, ⁇ .
  • the receiving end of the i-th link calculates the second transmitting power (0 according to the communication distance ⁇ , and the receiver sensitivity).
  • the calculation can be performed using the following formula:
  • the receiving end of the i th link calculates the ER radius r of the receiving end of the i th link according to the communication distance and the second transmitting power.
  • the calculation can be performed using the following formula:
  • G Is the number of correlations between different links, N. It is the Gaussian white noise power spectrum.
  • the receiving end of the i-th link receives the ER-RTS frame sent by the other node in addition to the ER-RTS frame of the transmitting end of the i-th link, and accordingly, The communication distance of the node and the ER radius corresponding to the node, so that multiple radii can be obtained, which can be represented by an array as follows: rk ⁇ ,... ⁇ ], where the receiving end of the i-th link can receive The number of nodes corresponding to the ER-RTS frame.
  • the receiving end of the i-th link can save the calculated set of ERs Radius, and node information corresponding to each ER radius.
  • the receiving end of the i-th link sends an ER-CTS that carries at least the second transmit power and the ER radius r.
  • the value of the Duration field in the ER-CTS frame can be set to 0.
  • the sending end of the i-th link After receiving the ER-CTS frame, the sending end of the i-th link performs transmission according to the second transmit power in a subsequent communication process, thereby implementing control of the transmit power.
  • i [l, 2, . . . , N], and the receiving end and the transmitting end of each link in the N links perform the processes of 201 to 206 above, each link The receiving end will find the respective ER radius, and the transmitting end of each link can control the transmitting power.
  • the PCP obtains the ER radius of the receiving end of each link by receiving the ER-CTS frame sent by the receiving end of each link.
  • the PCP randomly selects a first link with the smallest number of allocated slots in the N links, allocates the current time slot to the first link, and updates the number of allocated slots of the first link.
  • Each of the N links may have been assigned a time slot, or a time slot has not been allocated, and the number of allocated time slots may also be different. Therefore, each link may be assigned according to the allocated time.
  • the number of slots is sorted, so that the link with the smallest number of allocated slots can be determined. When there are multiple links with the smallest number of allocated slots, one of them can be randomly selected, thereby Less links set higher time slot allocation priorities, thereby ensuring fairness of time slot allocation.
  • updating the number of allocated slots of the first link means increasing the number of allocated slots of the first link by one.
  • the PCP randomly selects an ith link with the smallest number of assigned slots, and determines whether the i-th link and the current slot are Every A link satisfies the transmission condition. If yes, the current time slot is allocated to the i-th link, and the number of time slots allocated by the i-th link is updated; otherwise, the current time slot is not assigned to the i-th line. link.
  • the transmission condition is that the transmitting end of any link in the current time slot is located outside the ER of the receiving end of the i th link, and the transmitting end of the i th link is also located at the receiving end of any link in the current time slot.
  • the transmitting end of the i-th link does not interfere with any link in the current time slot
  • the transmitting end of any link in the current time slot does not interfere with the i-th link, thereby
  • the same time slot is allocated to satisfy the conditions of simultaneous transmission.
  • the link set consisting of the links in the current time slot may be one link or multiple links, and each link needs to meet the transmission condition.
  • the N links include: links 1, 2, and 3, and the links in the current time slot include links 1, 4, and 5, and the current time slot has been allocated to the N links in the first processing.
  • Link 1 where the number of slots of link 1 is 1, and the number of slots of links 2 and 3 is 0, then link 2 is randomly selected during the second processing and links 2 and 1, 2 are determined.
  • links 2 and 5 both satisfy the transmission condition, and if so, assign the current time slot to link 2, and increase the number of allocated time slots of link 2 by one; otherwise, the current time slot is not Assigned to link 2.
  • the update refers to adding 1 to the number of slots allocated for the i-th link.
  • the PCP sorts all unprocessed links by the number of allocated slots before each selection to determine the link with the smallest number of allocated slots.
  • the processing in this embodiment includes allocating a current time slot to the first link and determining a transmission condition of the link other than the first link and corresponding time slot allocation, for a link, regardless of Judge Whether the current time slot is allocated or not, the link is considered to be the processed link.
  • the foregoing method may further include:
  • the receiving end of the changed link sends a TPC request frame, and requests to adjust the transmit power.
  • the transmitting end of the changed link After receiving the TPC request frame, the transmitting end of the changed link returns at least the third transmit power or TPC frame of power adjustment information.
  • the third transmit power is an adjusted transmit power determined by the transmitting end of the changed link, and is used to transmit according to the third transmit power in a subsequent communication process, thereby implementing control and adjustment of the transmit power.
  • the power adjustment information is information related to the adjusted power, which is not specifically limited in this embodiment of the present invention. For example, if the power level is adjusted, the transmitting end may obtain the adjusted status according to the power level. Three transmit power.
  • any one of the N links may be a STA, and the STA is integrated with a transmitting end and/or a receiving end, which is not specifically limited in this embodiment of the present invention.
  • the method may further include:
  • any one of the N links A serves as the transmitting end of the link.
  • NAV Network Allocation Vector
  • Interframe Space (coordination function) Interframe Space, distributed ten-time adjustment function
  • the ER-RTS frame is sent to the receiving end node B of the link, otherwise the channel is continuously monitored. If the channel is busy but listens to other nodes' ER-RTS or ER-CTS frames, or listens to other nodes
  • the node A When the other node is the node B, the node A also sends data DATA to the node B for communication after the SIFS.
  • the method may further include:
  • the Node B receives the RTS frame of other nodes, it replies after the SIFS.
  • the CTS frame is given to the other nodes.
  • the other node is the transmitting node A of the link where the node B is located, the node B sends an ACK confirmation to the node A after receiving the data DATA.
  • the foregoing method provided in this embodiment determines whether to allocate a current time slot to a link according to a transmission condition determined by an ER radius, and ensures that a current time slot is allocated to a link that meets a transmission condition, and the ER radius is determined according to the communication distance, and is not fixed. Value, thus solving the problem that the time slot cannot be fully utilized when the time slot is allocated, The slot utilization and the efficiency of spatial multiplexing are improved, and the system capacity is also increased. Compared with the existing spatial multiplexing technology based on multi-beam smart antenna beamforming, the antenna implementation is not required to be used, and the hardware implementation difficulty is greatly reduced, and the error, the time consuming, the cost and the time complexity are solved.
  • the embodiment provides a device for allocating a spatial multiplexing of transmission time slots for a communication link, and the method for performing the foregoing embodiments includes:
  • the first processing module 301 is configured to randomly select an ith link with the smallest number of allocated time slots among the unprocessed links in the multiple links;
  • the second processing module 302 is configured to process the ith link, including:
  • the process may be performed by a determining unit included in the second processing module 302; wherein the radius of the ER of the receiving end of the i-th link is the receiving end of the i-th link Calculated according to the communication distance between the transmitting end and the receiving end of the i-th link;
  • the current time slot is allocated to the i-th link, and The number of time slots allocated for the i-th link is updated, and the process can be performed by one of the allocation units included in the second processing module 302.
  • the above device provided in this embodiment may specifically be a PCP.
  • the method in the foregoing method embodiment may be implemented on the device, and the specific implementation process is described in detail in the method embodiment, and details are not described herein again.
  • Any one of the links in the present embodiment may be a STA, and the sender and/or the receiving end are integrated in the STA, which is not specifically limited in this embodiment of the present invention.
  • the foregoing apparatus determines whether to allocate a current time slot to a link according to a transmission condition determined by an ER radius, and ensures that a current time slot is allocated to a link that meets a transmission condition, and the ER radius is determined according to the communication distance, and is not fixed.
  • the value solves the problem that the time slot cannot be fully utilized when the time slot is allocated, improves the time slot utilization rate and the efficiency of spatial multiplexing, and also improves the system capacity.
  • the antenna implementation is not required to be used, and the hardware implementation difficulty is greatly reduced, and the error, the time consuming, the cost and the time complexity are solved.
  • this embodiment provides a system for allocating a spatial multiplexing of transmission time slots for a communication link, including: a plurality of transmitting ends 401 and receiving ends 402, and means 403 as described in Embodiment 3; Forming N links between the plurality of transmitting ends and receiving ends;
  • the plurality of receiving ends 402 include the receiving end of the ith link described in Embodiment 3, and the plurality of transmitting ends 401 include the transmitting end of the ith link described in Embodiment 3;
  • the receiving end of the ith link is configured to calculate the radius of the ER according to the communication distance between the transmitting end and the receiving end of the i th link, and send the radius of the ER.
  • the sending end of the ith link is used to send an ER-RTS dedicated area request to send a frame at the first transmit power; and the receiving end of the ith link is used to receive the ER- After the RTS frame, the communication distance between the transmitting end and the receiving end is calculated according to the received power and the first transmitting power, and the second transmitting power is calculated according to the communication distance and the receiver sensitivity of the receiving end, and is calculated according to the second transmitting power and the communication distance.
  • the radius of the ER at the receiving end is returned, and an ER-CTS frame carrying at least the second transmitting power and the radius of the ER is returned.
  • the receiving end of the ith link is further configured to send a TPC request frame to the transmitting end of the changed i-th link when the i-th link changes, requesting to adjust the transmit power.
  • the transmitting end of the ith link is further configured to: after receiving the TPC request frame, return a TPC report frame carrying at least a third transmit power or power adjustment information to a receiving end of the i th link.
  • the transmitting end of the ith link in the embodiment may be integrated into a common station STA, and the receiving end of the ith link may be integrated into another STA, as described in the method embodiment. I will not repeat them here.
  • the system provided in this embodiment may implement the method in the foregoing method embodiment, and the specific implementation process is described in the method embodiment, and details are not described herein again.
  • the above system provided by the embodiment determines whether to allocate the current time slot to the link according to the transmission condition determined by the ER radius, and ensures that the current time slot is allocated to the link that meets the transmission condition, and the ER radius is determined according to the communication distance, and is not fixed. Value, thus solving the problem that the time slot cannot be fully utilized when the time slot is allocated, The slot utilization and the efficiency of spatial multiplexing are improved, and the system capacity is also increased. Compared with the existing spatial multiplexing technology based on multi-beam smart antenna beamforming, the antenna implementation is not required to be used, and the hardware implementation difficulty is greatly reduced, and the error, the time consuming, the cost and the time complexity are solved.
  • the spatial multiplexing mode adopted is a CDMA mode, which is not only applicable to an environment in which both sides of the communication use an omnidirectional antenna,
  • the embodiment of the present invention does not specifically limit the case where the directional antenna is used for the communication. If both sides of the communication use an omnidirectional antenna, the ER at the receiving end is circular; if both sides of the communication use a directional antenna, the ER at the receiving end is a sector.
  • the directional antenna can further suppress multipath fading, so that better receiving performance can be obtained.
  • the distributed network and the centralized network are respectively simulated, and the simulation results shown in FIG. 5 and FIG. 6 are obtained.
  • the distributed network refers to nodes in the network for one-to-one communication
  • the centralized network refers to nodes in the network for many-to-one communication.
  • the spatial multiplexing gain is the ratio of the channel capacity in CDMA mode to the channel capacity in TDMA mode. It can be seen from the figure that the spatial multiplexing scheme of the embodiment of the present invention obviously obtains a higher channel capacity than the existing spatial multiplexing scheme with a fixed ER radius, on the premise that the total transmit power is the same. In addition, simulation was also performed based on the receiver sensitivity, and the simulation results shown in Fig. 7 were obtained.
  • Each functional unit in the embodiment of the present invention may be integrated into one processing module, or each unit may exist physically separately, or two or more units may be integrated into one module.
  • the above integrated modules can be implemented in the form of hardware or in the form of software functional modules.
  • the integrated modules, if implemented in the form of software functional modules and sold or used as stand-alone products, may also be stored in a computer readable storage medium.
  • the above-mentioned storage medium may be a read only memory, a magnetic disk or an optical disk or the like.
  • Each of the above described devices or systems may perform the methods of the corresponding method embodiments.

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Abstract

La présente invention concerne le domaine des communications sans fil. L'invention porte sur un procédé et un appareil de multiplexage spatial, et un dispositif d'allocation d'intervalles de temps de transmission à une liaison de communication. Le procédé consistant à : sélectionner de manière aléatoire une ième liaison qui s'est vue allouer le plus petit intervalle de temps parmi les liaisons non traitées dans une pluralité de liaisons ; et traiter la ième liaison comme suit : déterminer si la ième liaison satisfait aux conditions de transmission suivantes : l'extrémité de transmission d'une liaison quelconque dans l'intervalle de temps actuel est située en dehors de l'ER de l'extrémité de réception de la ième liaison, et l'extrémité de transmission de la ième liaison est également située en dehors de l'ER de l'extrémité de réception d'une liaison quelconque, le rayon de l'ER de l'extrémité de réception de la ième liaison étant calculé en fonction de la distance de communication entre l'extrémité de réception et l'extrémité de transmission de la ième liaison ; si les conditions de transmission sont satisfaites, attribuer alors l'intervalle de temps à la ième liaison. La présente invention permet ainsi d'améliorer le taux d'utilisation des intervalles de temps ainsi que l'efficacité du multiplexage spatial.
PCT/CN2012/071734 2011-03-09 2012-02-28 Procédé et appareil de multiplexage spatial, et système d'attribution d'intervalles de temps de transmission à une liaison de communication Ceased WO2012119519A1 (fr)

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CN103199906B (zh) * 2013-03-14 2016-03-23 东南大学 毫米波高速通信系统波束扇区侦听的空间复用方法
CN111881584B (zh) * 2020-07-30 2023-02-28 中国电波传播研究所（中国电子科技集团公司第二十二研究所） 一种短波链路库的随机生成方法

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US20080019345A1 (en) * 2006-07-18 2008-01-24 Cheng-Hsuan Wu Method And Apparatus Of Dynamic Channel Assignment For A Wireless Network
CN101335970A (zh) * 2007-06-26 2008-12-31 中兴通讯股份有限公司 一种空分多址通信系统资源分配实现方法及装置
CN101873703A (zh) * 2009-04-27 2010-10-27 大唐移动通信设备有限公司 一种空分多址资源的调度方法和通信设备
CN102158967A (zh) * 2011-03-09 2011-08-17 华为技术有限公司 为通信链路分配传输时隙的空间复用的方法、装置和系统

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