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WO2010075654A1 - 请求资源的方法、设备和通信系统 - Google Patents

请求资源的方法、设备和通信系统 Download PDF

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Publication number
WO2010075654A1
WO2010075654A1 PCT/CN2009/000002 CN2009000002W WO2010075654A1 WO 2010075654 A1 WO2010075654 A1 WO 2010075654A1 CN 2009000002 W CN2009000002 W CN 2009000002W WO 2010075654 A1 WO2010075654 A1 WO 2010075654A1
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WO
WIPO (PCT)
Prior art keywords
resource
requesting device
request message
allocation
message
Prior art date
Application number
PCT/CN2009/000002
Other languages
English (en)
French (fr)
Inventor
沈钢
王栋耀
郑武
冷晓冰
Original Assignee
上海贝尔阿尔卡特股份有限公司
阿尔卡特朗讯
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 上海贝尔阿尔卡特股份有限公司, 阿尔卡特朗讯 filed Critical 上海贝尔阿尔卡特股份有限公司
Priority to US13/142,175 priority Critical patent/US9119188B2/en
Priority to PCT/CN2009/000002 priority patent/WO2010075654A1/zh
Priority to KR1020117018077A priority patent/KR20110101236A/ko
Priority to EP20090835941 priority patent/EP2375839A4/en
Priority to JP2011543958A priority patent/JP5345704B2/ja
Priority to CN200980144328.8A priority patent/CN102204384B/zh
Publication of WO2010075654A1 publication Critical patent/WO2010075654A1/zh

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/20—Control channels or signalling for resource management
    • H04W72/21—Control channels or signalling for resource management in the uplink direction of a wireless link, i.e. towards the network
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/20—Control channels or signalling for resource management
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
    • H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
    • H04L1/1812—Hybrid protocols; Hybrid automatic repeat request [HARQ]
    • 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
    • H04W72/0453—Resources in frequency domain, e.g. a carrier in FDMA
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/50—Allocation or scheduling criteria for wireless resources
    • H04W72/535—Allocation or scheduling criteria for wireless resources based on resource usage policies
    • 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
    • H04W72/566—Allocation or scheduling criteria for wireless resources based on priority criteria of the information or information source or recipient
    • H04W72/569—Allocation or scheduling criteria for wireless resources based on priority criteria of the information or information source or recipient of the traffic information
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/20—Control channels or signalling for resource management
    • H04W72/23—Control channels or signalling for resource management in the downlink direction of a wireless link, i.e. towards a terminal

Definitions

  • the present invention relates to mobile communications, and in particular to a method, device and communication system for requesting resources, which allows a resource allocation device to acknowledge a bandwidth request when receiving a resource (bandwidth) request of a resource requesting device and failing to allocate resources in time.
  • Background technique
  • a bandwidth request refers to a mechanism in which a mobile station indicates to a base station how much bandwidth it needs to make a corresponding uplink transmission.
  • the bandwidth request of the MS needs to take into account the number of bytes to be carried by the MAC (medium access control) PDU (protocol data unit).
  • the mobile station receives less than expected transmission opportunities or does not receive the uplink grant (UL grant) from the base station at all. This may be due to issues such as scheduling decisions, insufficient resources, and loss of request messages. For resource allocations that fail to match the requirements of the MS, the base station does not give a reason for the determination.
  • FIG. 7 shows the bandwidth request/authorization process provided in IEEE 802.16e.
  • the mobile station MS selects the CDMA ranging code if it needs to request the bandwidth and submits the CDMA ranging code to the base station BS in the ranging slot for the competition.
  • the base station BS upon detecting the CDMA ranging code, provides CDMA-IE UL allocation information to the mobile station MS.
  • step S703 the mobile station MS transmits a bandwidth request message to the base station in the allocated resources. Then, the base station BS should reply to the UL grant in step S704 to allocate the bandwidth resource requested by the mobile station. If the base station does not issue the UL allocation information described above. Or the bandwidth request does not cause the base station to allocate the corresponding bandwidth in the subsequent process in the specified time interval, and the mobile station fails the default bandwidth request, and performs the bandwidth request again or discards the corresponding SDU.
  • the mobile station MS After the mobile station MS sends the bandwidth request message, it expects to be able to receive the band from the base station BS.
  • UL grant o
  • the mobile station MS may not get the desired bandwidth allocation.
  • bandwidth request messages may be dropped or corrupted.
  • FIG. 8 After the transmitted bandwidth request message is lost, it is necessary to wait until the mobile station's timer expires before the mobile station transmits the CDMA content again. Therefore, the base station cannot correctly receive the bandwidth request message transmitted by the mobile station. This results in the inability to transmit the uplink grant message (UL grant) expected by the mobile station to the mobile station. Another reason relates to scheduling decisions.
  • the base station may decide to delay the bandwidth allocation to a specific mobile station, for example, allocate bandwidth to the mobile stations in subsequent frames, so that some of the bandwidths can be satisfied first.
  • the need for time-critical services Even if the mobile station does not receive the corresponding bandwidth allocation, the base station will not give it a clear explanation.
  • the mobile station detects the failed bandwidth request by judging whether the timer expires, and if the timer sets the waiting time until the mobile station does not receive the desired bandwidth allocation, restarts the new CDMA competition.
  • the mobile station In the case of a loss of bandwidth request message, the mobile station has to wait for an unnecessary time (i.e., the time period over which the timer expires) to retransmit the bandwidth allocation request. This increases the latency of the bandwidth request. 0 If the latency is configured to be shorter, the mobile station may retransmit the bandwidth request message even if the base station correctly obtains the original request, because the timer It may expire before the base station starts scheduling the UL grant for the mobile station. This results in unnecessary overhead and causes the base station to mistakenly treat it as a new request, as shown in FIG. The reason for this problem is that the base station that received the bandwidth request message does not acknowledge the reception of the message.
  • an unnecessary time i.e., the time period over which the timer expires
  • the IEEE 802.16m working group has begun to modify the IEEE 802.16 standard to improve the operational performance of licensed channels for air interfaces. According to the requirements document, this imposes more stringent requirements on bandwidth requests: less latency and less overhead. Therefore, the resolution of the above problems becomes more important.
  • Non-Patent Document 1 IEEE C80216m-08-635, BW-REQ channel design recommendations for IEEE 802.16m, Intel Corporation, 2008- 07-13
  • the mobile station explicitly confirm whether the base station receives the bandwidth request message, so that the random access can be restarted as soon as possible.
  • step S1001 when the mobile station has data to be transmitted in its buffer, the corresponding ranging code is selected for CDMA competition. Then, once the base station BS receives the CDMA contention from the mobile station, a corresponding CDMA-IE allocation is made, i.e., the mobile station is made aware of when or when the resource request message is sent.
  • step S1003 the mobile station transmits a resource request message on a corresponding time or resource.
  • step S1004 after receiving the resource request message from the mobile station, the base station makes an explicit confirmation.
  • step S1005 resource scheduling is performed on the base station side, and the requested resource is allocated to the mobile station, and is sent to the mobile card through the UL grant message.
  • step S1006 once the mobile station receives the resource allocated by the base station, the data to be transmitted in the buffer is sent to the base station on the resource.
  • Non-Patent Document 1 adds the step of confirming the bandwidth request (step S1004 in Fig. 10).
  • the base station receives the bandwidth request message from the mobile station, it explicitly provides an acknowledgment message to the request. This allows the mobile station to quickly restart the random access procedure in order to recover from a failed bandwidth request as quickly as possible.
  • the mobile station knows that it should receive an acknowledgment message ACK in the next frame, indicating that the base station has successfully received the bandwidth request message. If the mobile station does not receive an acknowledgment message from the base station, it knows that the previously sent request has been lost. The mobile station then resends the bandwidth request message, thus greatly reducing unnecessary waiting time (the period of time over which the timer expires).
  • the base station shall not provide some resources to make an ACK response, which includes at least the MS identifier (MS ID) or connection identifier and a confirmation indication. If it is carried by a message, the message transmission has its own format (header and message body), so the base station also has to allocate additional resources in the MAP IE to inform the mobile station where to receive the message.
  • MS ID MS identifier
  • the base station will promptly respond to the UL grant message to the mobile station.
  • the mobile station can receive UL gmnt very quickly. In this case, the confirmation of the bandwidth request becomes useless. This leads to unnecessary overhead. Summary of the invention
  • a method for requesting a resource from a resource requesting device by a resource requesting device includes the steps of: issuing a resource request message from the resource requesting device to the resource allocating device; after receiving the resource request message, if And the resource requesting device cannot allocate the resource within the set time interval, and then the acknowledgment of the resource request message is sent from the resource allocating device to the resource requesting device; and if the resource requesting device is allocated within the set time interval The resource, the resource allocation device does not send an acknowledgment to the resource requesting device for the resource request message.
  • the confirmation of the resource request message is sent from the resource allocation device to the resource requesting device by means of an uplink grant (UL grant)
  • the value indicating the resource size in the uplink grant transmitted by the resource allocation device is set to 0 in the case where the resource cannot be allocated within the set time interval for the resource requesting device.
  • the resource requesting device waits for the resource allocation from the resource allocating device.
  • the resource requesting device does not receive the valid resource allocation within the set time interval or the resource allocating device sends an acknowledgment to the resource requesting device to the resource requesting device, the resource requesting device starts to re-request the resource.
  • the resource requesting device detects whether the value indicating the resource size in the uplink grant is 0, and in the case where the value indicating the resource size is 0, the resource requesting device waits for resource allocation from the resource allocating device.
  • the resource includes at least a bandwidth.
  • a resource allocation device including: a transceiver unit that receives a resource request message from a resource requesting device; and a resource scheduling and allocation unit that determines, after receiving the resource request message, the receiving and receiving unit Whether the resource requesting device can allocate resources within a set time interval; the confirmation message generating unit generates a request for the resource if the resource cannot be allocated within the set time interval for the resource requesting device The message confirming the message; sending, by the transceiver unit, a message confirming the resource request message to the resource requesting device.
  • a resource requesting device comprising: a transceiver unit, transmitting a resource request message via the transceiver unit, and receiving a message from a resource allocation device; and detecting, by the detecting unit, whether the received message satisfies a predetermined schedule The condition of waiting for the resource allocation result from the resource requesting device when the detection result indicates that the received message satisfies the predetermined condition.
  • a communication system comprising the resource allocation device as described above and the resource requesting device as described above.
  • the present invention is to use implicit acknowledgment for reception of a bandwidth request message, instead of the acknowledgment method proposed in Non-Patent Document 1 above.
  • This enables the mobile station to know the loss of the bandwidth request message, and thus can resume the retransmission as soon as possible.
  • the proposed scheme of the present invention is capable of confirming a bandwidth request using scheduling signaling. If the base station decides not to allocate resources immediately due to the scheduling scheme, the base station still allocates a UL grant to those mobile stations that request bandwidth. However, the allocated resource size is, for example, zero. After receiving this special UL grant, the mobile station knows that the base station has correctly received its bandwidth request, but there is currently no suitable resource to allocate.
  • the mobile station will not attempt to resend the bandwidth request message, avoiding redundant re-requests. If the base station decides to allocate resources immediately and issues a UL grant response to the mobile station, the base station allocates resources as in the normal course of operation without requiring an additional acknowledgment message, thereby reducing overhead. If no UL grant (allocated expected resource or 0) is received within the set time interval after the mobile station sends the bandwidth request, it knows that the bandwidth request is lost. The mobile station will immediately resend the bandwidth request, thus greatly reducing unnecessary waiting time (ie, the period of time over which the timer expires).
  • the base station transmits additional acknowledgment messages only when needed, so the overhead is reduced more.
  • the scheme of the present invention does not change any signaling exchanged between the base station and the mobile station, the requirement of backward compatibility can be satisfied.
  • FIG. 2 is a schematic structural block diagram of a base station according to an embodiment of the present invention.
  • FIG. 3 is a schematic structural block diagram of a mobile station according to an example of a facility of the present invention.
  • FIG. 5 illustrates a process of resending a bandwidth request message in the event that a bandwidth request message is lost or corrupted in accordance with an embodiment of the present invention
  • Figure 6 illustrates a bandwidth request/authorization process in accordance with an embodiment of the present invention
  • FIG. 7 shows the bandwidth request/authorization process defined in IEEE 802.16e
  • Figure 8 shows the unnecessary waiting time before resending the bandwidth request
  • Figure 9 shows a case where the timer period is smaller than the scheduling delay of the base station
  • Fig. 10 shows a confirmation process for a bandwidth request according to Non-Patent Document 1.
  • FIG. 1 is a general structural diagram of a communication system according to an embodiment of the present invention.
  • the communication system includes a base station BS and mobile stations MS1 and V1S2.
  • base station BS and mobile stations MS1 and V1S2.
  • mobile stations MS1 and V1S2 are also configurations in which a plurality of base stations and a plurality of mobile stations together constitute a communication system.
  • FIG. 2 is a schematic structural block diagram of a base station according to an embodiment of the present invention.
  • Fig. 3 is a block diagram showing the schematic configuration of a mobile station according to an example of the installation of the present invention.
  • a base station 100 is provided with a transceiver unit 110, a resource scheduling and allocation unit 120, an acknowledgement message generating unit 130, and a buffer 140.
  • the mobile station 200 according to an embodiment of the present invention is provided with a transceiver unit 210, a buffer 220, and a detecting unit 230.
  • the mobile station is further provided with a timer 240.
  • FIG. 4 illustrates a process of confirming a bandwidth request in accordance with an embodiment of the present invention.
  • the base station For each valid bandwidth request, the base station is required to make a UL grant response immediately, regardless of whether the base station has made resource scheduling for the base station.
  • the UL grant is sent in accordance with the OFDMA UL-MAP IE format.
  • the OFDMA UL-MAP IE defines the UL bandwidth allocation, which is either specified by the block allocation (absolute offset) or by the duration in the slot (relative or absolute slot offset). .
  • the transceiver unit 210 of the mobile station selects an appropriate ranging code for CDMA contention.
  • the resource scheduling and allocation unit 120 of the base station 100 provides the mobile station 200 with corresponding CDMA-IE UL allocation information.
  • the transceiver unit 210 of the mobile station transmits a bandwidth request based on the amount of data in the buffer 220, and requests a certain bandwidth from the base station to transmit the data.
  • the resource scheduling and allocation unit of the base station 100 determines whether the mobile station can be allocated resources immediately. If not, in step S402, the acknowledgment message generating unit 130 sets the value of the specific field in the UL grant message to be transmitted to the mobile station, one method is to set the size of the allocated resource to 0, and then pass The transceiver unit 110 transmits to the mobile station.
  • the mobile station receives the corresponding UL grant, and the detecting unit 230 detects the identifier of the value of the specific field in the UL grant message, for example, detects whether the size of the allocated resource is 0, if it is 0. It indicates that the base station has successfully received the bandwidth request sent by the mobile station 200. In this case, the mobile station 200 continues to wait without retransmission.
  • step S403 in the case that the resource scheduling unit 120 has the appropriate resource allocated to the mobile station 200, it transmits the corresponding resource information, such as the size and location of the bandwidth, to the mobile station 200 through the UL grant message.
  • the transceiver unit 210 of the mobile station obtains the resource information from the received UL grant message, extracts the data to be transmitted from the buffer 220, and transmits the data to the base station 100 on the resource determined by the resource information.
  • the resource scheduling and allocation unit 120 of the base station 100 transmits the corresponding OFDMA UL-MAP IE according to a conventional operation without additional Embed confirmation of the bandwidth request message.
  • the OFDMA UL-MAP IE includes resources allocated according to the scheme.
  • the base station 100 may decide to delay resource allocation to some specific mobile stations, for example, to perform resource allocation for these specific mobile stations in subsequent frames according to a scheduling scheme, so as to satisfy some time-sensitive services. Demand. If so, base station 100 still sends the corresponding OFDMA UL-MAP IE to those base stations 200 that request bandwidth. However, the value indicating the resource size is set to 0 by the confirmation message generating unit 130. In particular, some fields of the OFDMA UL-MAP IE, such as OFDMA symbols (number of symbols used for OFDMA carrying UL bursts) field, subchannels (number of subchannels with subsequent indices), and duration fields ( The allocated duration in units of OFDMA slots should be zero.
  • OFDMA symbols number of symbols used for OFDMA carrying UL bursts
  • subchannels number of subchannels with subsequent indices
  • duration fields The allocated duration in units of OFDMA slots should be zero.
  • the base station transmits the OFDMA UL-MAP IE in a standard format. Therefore, the requirements for backward compatibility can be met without defining new messages or signaling. If there is no backward compatibility requirement, the base station optionally sends an OFDMA UL-MAP IE with an acknowledgment field embedded.
  • the base station if the base station correctly receives the bandwidth request but decides not to allocate resources immediately, the base station will send an acknowledgment field embedded in the UL grant.
  • the mobile station receives the particular UL grant, it knows that the base station has correctly received its bandwidth request and therefore waits for resource allocation. The mobile station will no longer attempt to resend the request, avoiding redundant re-requests.
  • FIG. 5 illustrates a process of resending a bandwidth request message in the event that a bandwidth request message is lost or corrupted in accordance with an embodiment of the present invention.
  • the base station 100 does not send any UL grant to the mobile station 200. Since the mobile station 100 fails to receive any UL grant at the desired point in time (e.g., the frame after the bandwidth request is issued), it knows that its bandwidth request is lost. The transceiver unit 210 of the mobile station 200 will immediately resend the bandwidth request, thus greatly reducing unnecessary waiting time.
  • Figure 6 illustrates a bandwidth request/authorization process in accordance with an embodiment of the present invention. This process is similar to the conventional procedure, except that the mobile station 200 needs to check the ACK information embedded in the UL-MAP, and there is no requirement to judge whether the timer expires.
  • the mobile station 200 first transmits a bandwidth request in accordance with the same procedure as the conventional one.
  • the mobile station 200 checks the UL-MAP to see if the desired time point is associated with the base station procedure and if the base station has notified the mobile station.
  • step S603 the mobile station 200 searches for the UL-MAP IE unit directed to itself, and determines whether it is possible to obtain its own UL-MAP IE unit in step S604. If the mobile station 200 cannot find a directed UL-MAP IE, it knows that the bandwidth request is lost in step S605. The mobile station will immediately resend the bandwidth request, thus greatly reducing the waiting time.
  • the mobile station 200 If the mobile station obtains a UL-MAP IE unit assigned to itself, the mobile station 200 knows that the base station has correctly received the bandwidth request. Therefore, the mobile station will no longer attempt to send bandwidth requests, avoiding redundant re-requests. Then, the detecting unit of the mobile station 200 detects in step S606 whether the resource allocated in the UL-MAP IE is 0. If the resource size is 0, this means that the base station 100 does not allocate resources to the mobile station in this frame, although the base station has correctly received the bandwidth request. The base station will allocate resources to the mobile station in subsequent frames according to the scheduling scheme. At step S607, the mobile station 200 waits for the arrival of a subsequent frame and repeats the UL-MAP check. In step S608, when the mobile station 200 obtains the UL-MAP IE with the effective bandwidth allocation, the transceiving unit 210 of the mobile station 200 transmits the data to be transmitted in the buffer 220 on the allocated time-frequency resource block.
  • the above confirmation enables the mobile station to know that the bandwidth request is lost and restart the transmission as early as possible. Therefore the mobile station is able to quickly recover from a failed bandwidth request. Compared to the traditional process, the waiting time before retransmission is greatly reduced.
  • the above scheme can carry an additional acknowledgment message in addition to the bandwidth allocation (UL-MAP IE). This eliminates the need to define any new messages or signaling for the acknowledgment process and therefore supports backward compatibility.
  • the base station When the base station decides to respond to the mobile station's request and immediately allocates resources, it does not need to send any additional acknowledgment messages.
  • the base station sends an acknowledgment of the bandwidth request only when needed, for example, when the base station correctly receives the request but does not immediately allocate resources. This kind of solution reduction greatly reduces the overhead.
  • the above scheme according to an embodiment of the present invention uses a confirmation of a bandwidth request.
  • the base station only confirms when needed. Therefore, the overhead is small.
  • the scheme according to an embodiment of the invention allows embedding additional acknowledgment messages in the bandwidth allocation without defining any new messages or signaling, thus supporting backward compatibility.
  • bandwidth request and acknowledgment between the base station and the mobile station can also be applied to scenarios such as resource application and allocation between BS-RS, RS-MS, BS-FemtoBS.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)
  • Data Exchanges In Wide-Area Networks (AREA)

Description

请求资源的方法、 设备和通信系统 技术领域
本发明涉及移动通信， 具体涉及一种请求资源的方法、 设备和通信系统， 其 允许资源分配设备在收到资源请求设备的资源（带宽）请求而不能及时分配资源 时， 对带宽请求进行确认。 背景技术
在 IEEE 802.16e中， 除了 UGS (unsolicited grant service, 主动授权业务）连 接之外， 所有的上行链路业务均需要向基站 BS进行带宽请求。 当移动站 MS在 其缓冲器中有数据等待进行上行链路发送时， 就进行上述的带宽请求。带宽请求 指的是这样的机制：移动站向基站表明它需要多大的带宽来进行相应的上行链路 发送。 MS 的带宽请求需要考虑到 MAC (medium access control, 介质接入控 制) PDU (protocol data unit, 协议数据单元） 所要携带的字节数目。 当基站接收 到来自移动站的带宽请求时，它考虑到可用的资源和调度方案来将资源分配给移 动站。有可能移动站接收到比预期少的传输机会， 或者根本收不到来自基站的上 行链路授权（UL grant)。 这可能是由于诸如调度判决、 不足的资源、 请求消息丢 失等问题引起的。对于未能与 MS的要求匹配的资源分配而言， 基站不会给出确 定的原因。
.图 7示出了在 IEEE 802.16e中提供的带宽请求 /授权过程。 在步骤 S701， 移 动站 MS—旦需要请求带宽， 就选择 CDMA测距码 （ranging code) 并且在用于 竞争的测距时隙（ranging slot)中将 CDMA测距码提交给基站 BS。在步骤 S702, 一旦检测到该 CDMA测距码， 基站 BS就向移动站 MS提供 CDMA— IE UL分配 信息。
在步骤 S703 , 移动站 MS在分配的资源中将带宽请求消息发送基站。 然后， 基站 BS应该在步骤 S704回复 UL授权 （UL grant)来分配移动站所请求的带宽 资源。如果基站没有发出上述的 UL分配信息。 或者在指定的时间间隔中带宽请 求并未引起基站在后续过程中分配相应的带宽， 移动站就默认带宽请求失败， 它 再次执行带宽请求或者丢弃相应的 SDU。
在移动站 MS发送带宽请求消息之后， 它就期望能够收到来自基站 BS的带 宽分配（UL grant) o但是，在一些情况下移动站 MS可能得不到期望的带宽分配。 —个原因是， 在一些恶劣的网络环境中， 带宽请求消息可能被丟弃或者被破坏。 如图 8所示， 在发送的带宽请求消息丢失后， 需要等到移动站的定时器过期移动 站才再次发送 CDMA竞争。 因此， 基站不能正确接收移动站发送的带宽请求消 息。这造成不能将移动站期望的上行链路授权消息（UL grant)发送给该移动站。 另一原因涉及调度判决， 如果基站认为可用资源不能满足所有的带宽请求， 基站 可能会决定延迟对特定移动站的带宽分配，例如在后续的帧中给这些移动站分配 带宽， 这样能够首先满足一些时延敏感的业务 （time-critical services ) 的需求。 即使移动站没有获得相应的带宽分配， 基站也不会给它明确的解释。移动站通过 判断定时器是否过期来检测失效的带宽请求，如果定时器设定的等待时间已到移 动站没有接收到期望的带宽分配， 则重新启动新的 CDMA竞争。
对于带宽请求消息丢失的情况， 移动站不得不等待不必要的时间（也就是定 时器过期所经过的时间段） 来重发带宽分配请求。 这增大了带宽请求的等待 ( latency )0 如果等待时间被配置为较短， 则即使在基站正确地获得原始的请求 的情况下， 移动站也可能重发带宽请求消息， 这是因为定时器可能在基站开始为 该移动站调度 UL grant的之前就过期。这导致不必要的开销并且导致基站错误地 将其作为新的请求， 如图 9所示。 出现这种问题的原因在于接收到带宽请求消息 的基站不对该消息的接收进行确认。
IEEE 802.16m工作组已经开始对 IEEE 802.16标准进行修改， 以便为空中接 口提高许可频道中操作性能的提高。根据需求文件， 这对带宽请求提出了更为严 格的要求： 更小的等待时间和更小的开销。 因此， 上述问题的解决变得更重要。
在 IEEE 802.16第 56次会议（2008年 7月）上， 英特尔提出了一种方案（非 专利文献 1： IEEE C80216m-08— 635, BW-REQ channel design recommendations for IEEE 802.16m, Intel Corporation, 2008-07-13 ), 让移动站明确地确认基站是否收 到带宽请求消息， 使得能够尽早重新开始随机接入。
如图 10所示， 在步骤 S1001 , 移动站在其缓冲器中有数据要发送时， 选择 相应的测距代码进行 CDMA 竞争。 然后， 一旦基站 BS 接收到来自移动站的 CDMA竞争， 就进行相应的 CDMA— IE分配， 也就是让移动站知道在何时或何 种资源中发送资源请求消息。
接下来，在步骤 S 1003,移动站在相应的时刻或者资源上发送资源请求消息。 在步骤 S1004， 基站接收到来自移动站的资源请求消息后， 做出明确的确认。 然 后， 在步骤 S1005 , 在基站侧进行资源调度， 为该移动站分配所请求的资源， 通 过 UL授权消息发送给移动张。 在歩骤 S1006, —旦移动站接收到基站分配的资 源， 就在该资源上向基站发送缓冲器中要发送的数据。
相比于 IEEE 802.16e中的过程，上述非专利文献 1的方案增加了确认带宽请 求这一步骤（图 10中步骤 S1004)。一旦基站接收到来自移动站的带宽请求消息， 它就明确地向该请求提供确认消息。这使得移动站能够迅速重新启动随机接入过 程， 以便尽快从失败的带宽请求中恢复。对于移动站， 它知道自己应该在下一帧 中接收到确认消息 ACK, 表示基站已经成功地接收到该带宽请求消息。 如果移 动站没有从基站接收到期挚的确认消息， 它就知道之前发送的请求已经丢失。然 后， 移动站重新发送带宽请求消息， 因此大大减小了不必要的等待时间 （定时器 过期所经过的时间段）。
尽管上述方案消除了移动站一侧的不必要的等待时间， 但是仍旧有缺点， 也 就是使得开销增大。 对于每个 MS请求， 基站都不得提供一些资源来做出 ACK 响应， 这至少包括 MS标识符 （MS ID ) 或者连接标识以及确认指示。 如果它由 某个消息携带， 则该消息传输具有自己的格式 （报头和消息体）， 因此基站同样 不得不在 MAP IE中分配额外的资源来告知移动站在哪儿接收消息。 但是， 对于 大多数上行带宽请求，当基站接收到来自移动站的带宽请求时它会及时向移动站 回应 UL grant消息。移动站可以很快接收到 UL gmnt。在这种情况下， 对带宽请 求的确认变得没有用处。 因此导致了不必要的开销。 发明内容
本发明的目的是提供一种资源请求方法、设备和通信系统， 它许资源分配方 在收到移动站的资源（带宽）请求而不能及时分配资源时，对带宽请求进行确认。
根据本发明的第一方面，提出了一种由资源请求设备向资源分配设备请求资 源的方法， 包括步骤： 从资源请求设备向资源分配设备发出资源请求消息； 在接 收到资源请求消息后，如果针对所述资源请求设备而言不能在设定的时间间隔内 分配资源， 则从资源分配设备向资源请求设备发送对资源请求消息的确认； 以及 如果在设定的时间间隔内给资源请求设备分配资源，则资源分配设备不向资源请 求设备发送对资源请求消息的确认 . · 优选地， 如果针对所述资源请求设备而言不能在设定的时间间隔内分配资 源， 则借助于上行链路授权 （UL grant) 从资源分配设备向资源请求设备发送对 资源请求消息的确认
优选地，在针对所述资源请求设备而言不能在设定的时间间隔内分配资源的 情况下资源分配设备发送的上行链路授权中表示资源大小的值被设置为 0。
优选地，如果资源请求设备在设定的时间间隔内收到资源分配设备向资源请 求设备发送对资源请求消息的确认，则资源请求设备等待来自资源分配设备的资 源分配。
优选地，其中资源请求设备在设定的时间间隔内没有收到有效资源分配或者 资源分配设备向资源请求设备发送对资源请求消息的确认，则资源请求设备开始 重新请求资源。
优选地， 资源请求设备检测上行链路授权中表示资源大小的值是否为 0， 在 表示资源大小的值为 0的情况下，资源请求设备等待来自资源分配设备的资源分 配。
优选地， 所述资源至少包括带宽。
根据本发明的第二方面， 提出了一种资源分配设备， 包括： 收发单元， 接收 来自资源请求设备的资源请求消息； 资源调度和分配单元， 在收发单元接收到资 源请求消息后，判断针对所述资源请求设备而言是否能够在设定的时间间隔内分 配资源； 确认消息生成单元，如果针对所述资.源请求设备而言不能在设定的时间 间隔内分配资源， 则生成对资源请求消息进行确认的消息； 通过所述收发单元将 对资源请求消息进行确认的消息发送给资源请求设备。
根据本发明的第三方面， 提出了一种资源请求设备， 包括： 收发单元， 经 由所述收发单元发送资源请求消息， 以及接收来自资源分配设备的消息； 检测 单元， 检测接收的消息是否满足预定的条件； 在检测结果表明接收的消息满足 预定的条件时， 等待来自资源请求设备的资源分配结果。
根据本发明的第四方面， 提出了一种通信系统， 包括如上所述的资源分配设 备和如上所述的资源请求设备。
如上所述， 本发明是要对带宽请求消息的接收使用隐式确认， 而非上述非专 利文献 1提出的确认方法。这使得移动站能够知道带宽请求消息的丢失， 因此能 够尽快重新开始重传。 换言之， 本发明所提出的方案能够在利用调度信令对带宽申请进行确认。如 果因调度方案的缘故基站决定不立即分配资源，则基站仍旧分配 UL grant给那些 请求了带宽的移动站。 但是所分配的资源大小例如是 0。 在接收到这种特殊的 UL grant后， 移动站知道基站已经正确地接收到了它的带宽请求， 只不过目前没 有合适的资源来分配。 因此移动站将不会尝试重新发送带宽请求消息， 避免了冗 余的重新请求。如果基站决定立即分配资源并且给移动站发出 UL grant响应，则 基站按照正常操作过程那样分配资源， 而不需要附加的确认消息， 从而减小了开 销。如果移动站发出带宽请求后的设定的时间间隔内未接收到任何 UL grant (分 配的期望资源或者 0)， 它就得知带宽请求丢失。 移动站将立即重新发送带宽请 求， 因此大大减小了不必要的等待时间 （也就是定时器过期经过的时间段）。
利用本发明的方法和结构， 仅仅在需要时基站才发送额外的确认消息， 因此 开销降低的更多。另外， 由于本发明的方案并不改变基站和移动站之间交换的任 何信令， 因此能够满足后向兼容的要求。 附图说明
现在参照附图， 仅以示例的方式对本发明的实施例进行描述， 在附图中： 图 1是根据本发明实施例的通信系统的总体结构图；
图 2是根据本发明实施例的基站的示意性结构框图；
图 3是根据本发明设施例的移动站的示意性结构框图；
图 4示出了根据本发明实施例的对带宽请求的确认的过程；
图 5 示出了根据本发明的实施例在带宽请求消息丢失或者被破坏的情况下 重新发送带宽请求消息的过程；
图 6示出了根据本发明实施例的带宽请求 /授权过程；
图 7示出了 IEEE 802.16e中定义的带宽请求 /授权过程；
图 8示出了在重新发送带宽请求之前的不必要的等待时间；
图 9示出了定时器时间段小于基站的调度延迟的情况； 以及
图 10示出了根据非专利文献 1的对带宽请求的确认过程。 具体实施方式
下面， 参考附图详细说明本发明的优选实施方式。 虽然示于不同的附图中， 伹相同的附图标记用于表示相同的或相似的组件。为了清楚和简明， 包含在这里 的与本发明的主题不相关的已知功能和结构的详细描述将被省略，避免它们使本 发明的主题不清楚。
图 1是根据本发明实施例的通信系统的总体结构图。 如图 1所示， 该通信 系统包括基站 BS和移动站 MS1和 ] V1S2。 自然， 也存在多个基站和多个移动站 一起构成通信系统的配置。
图 2是根据本发明实施例的基站的示意性结构框图。图 3是根据本发明设施 例的移动站的示意性结构框图。
如图 2所示， 根据本发明实施例的基站 100具备收发单元 110、 资源调度和 分配单元 120、 确认消息生成单元 130和缓冲器 140。 如图 3所示， 根据本发明 实施例的移动站 200具备收发单元 210、 缓冲器 220、 检测单元 230。 根据另 -- 实施方式， 移动站还具备定时器 240。 下面结合具体的例子来详细描述上述基站 和移动站的具体构造和操作过程。
图 4示出了根据本发明实施例的对带宽请求的确认的过程。对于每个有效的 带宽请求，都需要基站立刻做出 UL grant响应，而不管基站是否已经为该基站做 出资源调度。 UL grant 是按照 OFDMA UL- MAP IE 的格式发送的。 OFDMA UL-MAP IE定义了 UL带宽分配， 该带宽分配或者是由块分配（绝对偏移量）指 定的， 或者是由时隙中的持续时间 （相对或者绝对时隙偏移量） 来指定的。
当移动站 200的缓冲器 220中有要发送的数据时，移动站的收发单元 210选 择合适的测距代码进行 CDMA竞争。 基站 100的资源调度和分配单元 120为移 动站 200提供相应的 CDMA— IE UL分配信息。 在该分配信息所指定的位置或者 时刻， 在步骤 S401， 移动站的收发单元 210根据缓冲器 220中的数据量发送带 宽请求， 向基站要求一定的带宽来发送这些数据。
根据本发明的实施例， 在接收到移动站 200的带宽请求消息后， 基站 100的 资源调度和分配单元确定是否能够立刻给该移动站分配资源。如果不能， 则在歩 骤 S402, 由确认消息生成单元 130将要发送给移动站的 UL授权消息中的特定 字段的值设定标识， 一种方法是将分配资源的大小设定为 0， 然后通过收发单元 110发送给移动站。
在下一帧， 移动站接收到了相应的 UL授权， 由检测单元 230检测 UL授权 消息中的特定字段的值的标识， 例如检测分配资源的大小是否为 0 ， 如果是 0 则表明基站已经成功收到该移动站 200发送的带宽请求。在这种情况下， 移动站 200继续等待, 而不进行重发。
在步骤 S403,在资源调度^ 1分配单元 120有合适的资源分配给该移动站 200 的情况下， 它通过 UL授权消息将相应的资源信息， 例如带宽的大小和位置等， 发送给移动站 200。在步骤 S404, 移动站的收发单元 210从接收的 UL授权消息 中得到资源信息， 从缓冲器 220中取出要发送的数据， 在资源信息所确定的资源 上将数据发送给基站 100。
根据本发明的实施例，如果基站 100已经在当前帧中将一些资源调度给移动 站， 则基站 100的资源调度和分配单元 120按照常规的操作发送相应的 OFDMA UL-MAP IE,而不需要额外嵌入对带宽请求消息的确认。 OFDMA UL-MAP IE 包 括根据该方案分配的资源。
如上所述， 在一些情况下，基站 100会决定延迟对一些特定移动站的资源分 配，例如按照调度方案在后续的帧中针对这些特定的移动站进行资源分^， 这样 能够满足一些时间敏感业务的需求。如果这样， 基站 100仍旧向那些请求带宽的 基站 200发送相应的 OFDMA UL-MAP IE。但是， 由确认消息生成单元 130将表 示资源大小的值设置为 0。 .具体而言， OFDMA UL- MAP IE的一些字段， 例如 OFDMA符号（用于携带 UL脉冲串的 OFDMA的符号的数目）字段、子信道（带 有后续索引的子信道数目）以及持续时间字段（以 OFDMA时隙为单位指示所分 配的时长）应当为 0。 基站以标准格式发送 OFDMA UL-MAP IE。 因此能够满足 后向兼容的要求， 而不用定义新的消息或者信令。如果没有后向兼容的要求， 基 站可选地发送嵌入了确认字段的 OFDMA UL- MAP IE。
在如图 4所示的过程中， 如果基站正确地接收到带宽请求， 但是决定不立即 分配资源，基站将发送嵌入到 UL grant中的确认字段。当移动站接收到该特定的 UL grant, 则它知道基站已经正确地接收到它的带宽请求， 因此等待资源分配。 移动站将不再尝试重新发送请求， 避免冗余的重新请求。
图 5 示出了根据本发明的实施例在带宽请求消息丢失或者被破坏的情况下 重新发送带宽请求消息的过程。 在这种情况下， 基站 100并不发送任何 UL grant 给移动站 200。由于移动站 100在期望的时间点（例如带宽请求发出后的那一帧） 未能收到任何 UL grant,它知道自己的带宽请求丢失。移动站 200的收发单元 210 将立即重新发送带宽请求， 因此大大减小了不必要的等待时间。 图 6示出了根据本发明实施例的带宽请求 /授权过程。 该过程类似于传统的 过程， 不同之处在于移动站 200需要检査嵌入在 UL- MAP 中的 ACK信息， 并 且不存在是否判断定时器过期的要求。
在步骤 S601 , 移动站 200首先按照与传统相同的过程发送带宽请求。 在步 骤 S602, 在期望的时间点 （例如下一帧）， 移动站 200捡查 UL- MAP, 看期望的 时间点是否与基站过程相关联以及基站是否通知了移动站。
然后， 在步骤 S603 , 移动站 200搜索定向到自己的 UL-MAP IE单元， 并且 在步骤 S604判断能否获得自己的 UL- MAP IE单元。如果移动站 200不能找到定 向到自己的 UL-MAP IE, 则在步骤 S605它知道带宽请求丢失。 移动站将立即重 新发送带宽请求， 因此大大减小了等待时间。
如果移动站获得了分给自己的 UL- MAP IE单元， 则移动站 200知道基站已 经正确地接收到了带宽请求。因此移动站将不再尝试发送带宽请求， 避免了冗余 的重新请求。然后， 移动站 200的检测单元在步骤 S606检测 UL-MAP IE中分配 的资源是否为 0。 如果资源大小是 0， 这意味着基站 100没有在此帧中分配资源 给移动站， 尽管基站已经正确地接收到了带宽请求。基站将根据调度方案在后续 的帧中向该移动站分配资源。 在步骤 S607, 移动站 200等待后续帧的到来并且 重复进行 UL-MAP检查。 在步骤 S608, 当移动站 200获得具有有效带宽分配的 UL-MAP IE时， 移动站 200的收发单元 210就在分配的时频资源块上发送缓冲 器 220中要发送的数据。
如上所述，上述的确认使得移动站能够尽早得知带宽请求丢失并且重新幵始 发送。 因此移动站能够快速从失败的带宽请求恢复。 相比于传统的过程， 重传之 前的等待时间大大缩小。
另外， 上述方案能够在带宽分配 （UL-MAP IE) 之外携带额外的确认消息。 这不用为确认过程定义任何新的消息或者信令， 因此支持后向兼容。
当基站决定对移动站的请求做出响应并且立即分配资源时，它不需要发送任 何额外的确认消息。仅仅在需要的时候， 例如在基站正确地接收到请求但是不立 即分配资源时， 基站才发送对带宽请求的确认。 这种方案降低大大降低了开销。
在非专利文献 1提出的确认过程中，由于基站不得不消耗资源来对每个带宽 请求做出响应， 导致了较大的开销。 相比之下， 根据本发明实施例的上述方案对 带宽请求使用确认。 仅仅在需要的时候基站才做出确认。 因此开销较小。 另外， 根据本发明实施例的方案允许在带宽分配中嵌入额外的确认消息，而不要定义任 何新的消息或者信令， 因此支持后向兼容。
虽然以上描述的是基站和移动站之间的带宽请求和确认，但是上述方案也可 以应用于诸如 BS- RS， RS-MS, BS- FemtoBS之间资源申请和分配的场景中。
本发明参照其示例性实施例具体地进行说明和描述，但本发明不局限与其实 施例， 本领域普通技术人员应理解， 各种对形式和细节所做的改变不背离如权利 要求所限定的本发明的精神和范围。

Claims

权利要求
1、 一种由资源请求设备向资源分配设备请求资源的方法， 包括步骤- 从资源请求设备向资源分配设备发出资源请求消息；
在接收到资源请求消息后，如果针对所述资源请求设备而言不能在设定的时 间间隔内分配资源，则从资源分配设备向资源请求设备发送对资源请求消息的确 认； 以及
如果在设定的时间间隔内给资源请求设备分配资源，则资源分配设备不向资 源请求设备发送对资源请求消息的确认。
2、 如权利要求 Γ所述的方法， 其中， 如果针对所述资源请求设备而言不能 在设定的时间间隔内分配资源， 则借助于上行链路授权 （UL grant) 从资源分配 设备向资源请求设备发送对资源请求消息的确认。
3、 如权利要求 2所述的方法， 其中在针对所述资源请求设备而言不能在设 定的时间间隔内分配资源的情况下资源分配设备发送的上行链路授权中表示资 源大小的值被设置为 0。
4、 如权利要求 1所述的方法， 其中， 如果资源请求设备在设定的时间间隔 内收到资源分配设备向资源请求设备发送对资源请求消息的确认，则资源请求设 备等待来自资源分配设备的资源分配。
5、 如权利要求 1所述的方法， 其中资源请求设备在设定的时间间隔内没有 收到有效资源分配或者资源分配设备向资源请求设备发送对资源请求消息的确 认， 则资源请求设备开始重新请求资源。
6、 如权利要求 4所述的方法， 其中资源请求设备检测上行链路授权中表示 资源大小的值是否为 0， 在表示资源大小的值为 0的情况下， 资源请求设备等待 来自资源分配设备的资源分配。
7、 如权利要求 1所述的方法， 其中所述资源至少包括带宽。
8、 一种资源分配设备， 包括：
收发单元， 接收来自资源请求设备的资源请求消息；
资源调度和分配单元， 在收发单元接收到资源请求消息后， 判断针对所述资 源请求设备而言是否能够在设定的时间间隔内分配资源；
确认消息生成单元，如果针对所述资源请求设备而言不能在设定的时间间隔 内分配资源， 则生成对资源请求消息迸行确认的消息；
通过所述收发单元将对资源请求消息进行确认的消息发送给资源请求设备。
9、 如权利要求 8所述的资源分配设备， 其中， 如果针对所述资源请求设备 而言不能在设定的时间间隔内分配资源，则确认消息生成单元借助于上行链路授 权 （UL grant) 生成该用于确认的消息。
10、如权利要求 9所述的资源分配设备， 其中在针对所述资源请求设备而言 不能在设定的时间间隔内分配资源的情况下发送的上行链路授权中表示资源大 小的值被设置为 0。
11、 如权利要求 8所述的资源分配设备， 其中所述资源至少包括带宽。
12、 一种资源请求设备， 包括： .
收发单元， 经 ώ所述收发单元发送资源请求消息， 以及接收来自资源分配设 备的消息；
检测单元， 检测接收的消息是否满足预定的条件；
在检测结果表明接收的消息满足预定的条件时，等待来自资源请求设备的资 源分配结果。
13、 如权利要求 12所述的资源请求设备， 其中， 如果资源请求设备在设定 的时间间隔内收到有资源分配设备向资源请求设备发送对资源请求消息的确认， 则资源请求设备等待来自资源分配设备的资源分配。
14、 如权利要求 12所述的资源请求设备， 其中资源请求设备在设定的时间 间隔内没有收到有效资源分配或者资源分配设备向资源请求设备发送对资源请 求消息的确认， 则资源请求设备开始重新请求资源。
15、 如权利要求 14所述的资源请求设备， 其中资源请求设备的检测单元检 测上行链路授权中表示资源大小的值是否为 0, 在表示资源大小的值为 0的情况 下， 资源请求设备等待来自资源分配设备的资源分配。
16、 如权利要求 12所述的资源请求设备， 其中所述资源至少包括带宽。
17、 一种通信系统， 包括如权利要求 8 所述的资源分配设备和如权利要求 12所述的资源请求设备。
PCT/CN2009/000002 2009-01-04 2009-01-04 请求资源的方法、设备和通信系统 WO2010075654A1 (zh)

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PCT/CN2009/000002 WO2010075654A1 (zh) 2009-01-04 2009-01-04 请求资源的方法、设备和通信系统
KR1020117018077A KR20110101236A (ko) 2009-01-04 2009-01-04 리소스를 요청하기 위한 방법, 디바이스 및 통신 시스템
EP20090835941 EP2375839A4 (en) 2009-01-04 2009-01-04 METHOD, DEVICE AND COMMUNICATION SYSTEM FOR RESOURCE REQUEST
JP2011543958A JP5345704B2 (ja) 2009-01-04 2009-01-04 リソースを要求する方法、装置、および通信システム
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JP5345704B2 (ja) 2013-11-20
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