WO2008113243A1 - Méthode et dispositif d'attribution de créneaux de temps garantis - Google Patents

Méthode et dispositif d'attribution de créneaux de temps garantis Download PDF

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Publication number
WO2008113243A1
WO2008113243A1 PCT/CN2007/071406 CN2007071406W WO2008113243A1 WO 2008113243 A1 WO2008113243 A1 WO 2008113243A1 CN 2007071406 W CN2007071406 W CN 2007071406W WO 2008113243 A1 WO2008113243 A1 WO 2008113243A1
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Prior art keywords
gts
node
shared
request
allocation
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PCT/CN2007/071406
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English (en)
Chinese (zh)
Inventor
Pei Liu
Pingping Xu
Huamin Chen
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Huawei Technologies Co., Ltd.
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Publication of WO2008113243A1 publication Critical patent/WO2008113243A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00—Data switching networks
    • H04L12/66—Arrangements for connecting between networks having differing types of switching systems, e.g. gateways

Definitions

  • the present invention relates to a wireless personal area network (WPAN) technology, and in particular to a time slot guarantee mechanism (GTS, Guaranteed Time Slot) time slot allocation method and device.
  • WPAN wireless personal area network
  • GTS Guaranteed Time Slot
  • WPAN is a low-rate, low-power, low-complexity network that includes a large number of wireless nodes. Potential applications include sensors, remote control toys, smart badges, remote controls, and home automation devices.
  • IEEE Institution of Electrical and Electronics Engineers
  • MAC Media Access Control
  • Its transmission range is about 10m in the typical transmission range of WPAN.
  • the standard specifies three optional data rates for WPAN: 250kbit/s, 40kbit/s, and 20kbit/s; two addressing modes: 16-bit and 64-bit addressing; three operating bands: 2.4GHz 16 channels, 10 channels in the 915 MHz band and 1 channel in the 868 MHz band.
  • the IEEE 802.15.4 standard specifies that WPAN has two modes of operation, one is beacon-enabled mode and the other is ⁇ beacon-enabled mode.
  • the non-beacon enable mode all nodes in the network compete for the channel through the non-slot carrier sense multi-access/collision avoidance (CSMA/CA, Carrier Sense Multi-Access/Collision Avoidance) algorithm.
  • CSMA/CA Non-slot carrier sense multi-access/collision avoidance
  • QoS quality of service
  • the beacon enable mode the network coordinator periodically sends a superframe to organize communication, and the real-time communication and quality of service can be obtained by using a superframe method to allocate non-contention time slots in a superframe for communication transmission. Satisfy. Compared with the non-beacon enable mode, the beacon enable mode better guarantees real-time transmission quality and quality of service.
  • FIG. 1 is a schematic diagram of a structure of a conventional superframe.
  • the transmission interval of two consecutive beacon frames is represented by a beacon interval (BI, Beacon Interval), which is divided into an active period and an inactive period.
  • the active period includes a beacon frame transmission period, a CAP (Contention Access Period), and a non-contention access period (CFP, Contention Free Period).
  • CAP Contention Access Period
  • CCP Contention Free Period
  • the active period of the superframe also known as the superframe duration (SD) is divided into 16 equal-length slots, as shown in Figure 1 from 0 to 15.
  • the length of each time slot, and the number of time slots included in the CAP are preset by the network coordinator and broadcast to all nodes in the network through the beacon frame transmission period at the beginning of the superframe.
  • BI and SD are related to the beacon frame index (BO, Beacon Order) and superframe index (SO, Superframe Order), respectively, and the calculation formulas are as shown in formula (1) and formula (2):
  • SD aBaseSuperframeDuration x 2 S0 ( 2 )
  • each node transmits data through the non-slotted CSMA/CA algorithm to compete for the channel.
  • the channel can be contiguous during the CAP period.
  • the node can get The obtained GTS directly transmits data without using the CSM A/CA algorithm to compete for the channel.
  • the minimum length of the CAP period (aMinCAPLength) is 440symbols, but if GTS is used, the length of the CAP is allowed to be temporarily less than the minimum length value.
  • the GTS request consists of an MHR domain, a command frame identifier field, and a GTS feature field.
  • the MHR field includes 7 bytes for identifying MAC frame header information.
  • the command frame identifier field includes 1 byte for The request is identified as a GTS request; the GTS feature field includes 1 byte for identifying the feature information of the GTS request.
  • the GTS feature field is composed of a GTS length field, a GTS direction field, a feature type field, and a reserved field, where the GTS length field includes 3 bits for identifying when the GTS request is requested to be allocated or released.
  • the GTS direction field includes 1 bit for identifying the GTS direction, for example, uplink or downlink.
  • the feature type field includes 1 bit, which is used to identify the type of the GTS request, that is, whether the GTS request is a GTS allocation request or GTS release request.
  • the network coordinator After receiving the GTS request sent by the node, the network coordinator checks whether the remaining time slots in the current superframe that can be used for GTS allocation meet the GTS request requirement according to the information carried in the GTS request, that is, whether it is greater than or equal to the GTS length field. The number of time slots required to be allocated, if not satisfied, rejects the GTS request; if so, accepts the GTS request and allocates a GTS requiring the number of allocated time slots. After that, the node that initiated the GTS request passes The beacon frame learns the GTS start and end time allocated by itself, and transmits data during the start and stop time of the GTS.
  • each GTS includes at least one time slot, that is, the minimum granularity of the GTS is one time slot, the nodes that are smaller in the transmission rate cannot fully utilize the applied GTS, thereby causing waste of resources. Summary of the invention
  • the embodiment of the invention provides a GTS allocation method, which can improve the GTS utilization rate.
  • the embodiment of the invention provides a GTS distribution device, which can improve the GTS utilization rate.
  • the technical solution of the embodiment of the present invention is implemented as follows:
  • a time slot guarantee mechanism GTS allocation method includes:
  • the requesting node receives a GTS request from the requesting node, when it is determined that the remaining time slots in the current superframe that can be used for the GTS allocation cannot satisfy the GTS request requirement, the requesting node is allocated a GTS time slot according to the shared GTS allocation mode.
  • a GTS distribution device comprising:
  • a first determining module configured to receive a GTS request from the requesting node, to determine whether the remaining time slots in the current superframe that can be used for GTS allocation meet the GTS request requirement;
  • a shared GTS allocation module configured to determine that the result of the first determining module is current
  • the requesting node is allocated a GTS time slot according to a shared GTS allocation mode.
  • the network coordinator after receiving the GTS request sent by the node, the network coordinator adaptively selects an appropriate GTS allocation mode according to the current network condition, thereby realizing efficient and reasonable allocation of network resources. , improved GTS utilization.
  • FIG. 1 is a schematic diagram of a structure of a conventional superframe
  • FIG. 3 is a flow chart of one embodiment of a method of the present invention.
  • FIG. 4 is a schematic diagram of a node B transmitting data by using an allocated GTS according to an embodiment of the present invention
  • FIG. 5 is a schematic diagram of a data arrival curve of a node A according to an embodiment of the present invention
  • FIG. 6 is a schematic diagram of a node B sharing a same GTS with a node A according to an embodiment of the present invention
  • FIG. 7 is a schematic diagram of three nodes sharing the same GTS according to an embodiment of the present invention
  • FIG. 8 is a schematic diagram of a comparison between the existing GTS allocation mode and the improved GTS utilization mode of the GTS allocation mode of the present invention.
  • FIG. 9 is a schematic structural diagram of an embodiment of an apparatus according to the present invention.
  • FIG. 10 is a schematic structural diagram of a shared GTS allocation module according to an embodiment of the present invention. Mode for carrying out the invention
  • the GTS request from the requesting node is received, and it is determined whether the remaining time slots in the current superframe that can be used for GTS allocation meet the GTS request requirement. If not, the GTS is allocated to the requesting node according to the shared GTS allocation mode. Time slot, ie allocation request The node shares its assigned GTS with the node that has been currently assigned to the GTS; if so, the requesting node is assigned a GTS slot in accordance with the existing GTS allocation.
  • the specific performer of the foregoing steps in the embodiment of the present invention may be a network coordinator.
  • FIG. 2 is a general flow chart of an embodiment of a method of the present invention. As shown in Figure 2, the following steps are included:
  • Step 201 The network coordinator receives the GTS request from the requesting node, and determines whether the remaining time slots in the current superframe that can be used for the GTS allocation meet the GTS request requirement. If yes, step 202 is performed; otherwise, step 203 is performed.
  • the network coordinator determines whether the remaining time slots in the current superframe that can be used for GTS allocation can satisfy the number of time slots allocated in the GTS request.
  • the extended GTS request consists of 11 bytes: the first to seventh bytes are MHR fields; the eighth byte is the command frame identification field; the 9th through 11th bytes are GTS feature fields.
  • Table 4 shows the format of the GTS feature field in the extended GTS request: Bit:
  • GTS length GTS feature burst data to delay allocation reservation direction type length reach rate requirement type
  • the extended GTS feature field has an allocation type field, a burst length field, a data arrival rate field, and a delay requirement field compared to the existing GTS feature field.
  • the burst length field, the data arrival rate field, and the delay requirement field are respectively used to identify the burst length, the data arrival rate, and the delay requirement information of the service of the requesting node, and an allocation type field, which is used to identify whether the requesting node is allowed.
  • the network coordinator assigns GTS time slots to it according to the shared GTS allocation mode, which can be set to 1 or 0.
  • the allocation type field is set to the requesting node to allow the network coordinator to assign a GTS time slot to it according to the shared GTS allocation mode, such as 1, the burst length field, the data arrival rate field, and the delay requirement field respectively set the service of the requesting node.
  • the length of the transmission, the rate of arrival of the data, and the delay requirement information; otherwise, the burst length field, the data arrival rate field, and the delay requirement field are set to null.
  • the number of bits occupied by each flag bit and their order in the extended GTS feature field can be adjusted according to the actual situation, and does not have to be exactly the same as shown in Table 4, as long as the setting is completed, the node Both the network coordinator and the network coordinator understand the purpose of the settings and know how to perform the corresponding operations according to the settings made.
  • Step 202 The network coordinator allocates a GTS time slot to the requesting node according to an existing GTS allocation manner.
  • Step 203 The network coordinator allocates a GTS time slot to the requesting node according to the shared GTS allocation mode.
  • the specific process of the network coordinator assigning the GTS time slot to the requesting node according to the shared GTS allocation mode is: The network coordinator selects the shared node from the nodes that have currently allocated the GTS time slot, and the selection method is many, for example, may be randomly selected; or, one of the nodes currently assigned to the GTS is selected in descending order of GTS utilization. Or a plurality of shared nodes, the specific selection manner may be: the network coordinator calculates the GTS utilization rate of each node that has been allocated to the GTS, and determines whether the number of time slots included in the GTS allocated by the node with the lowest GTS utilization rate is satisfied.
  • the GTS request request if yes, the node is selected as the shared node; if not, the sum of the number of slots allocated by the node with the lowest GTS utilization rate and the node with the lowest GTS utilization rate satisfies the GTS request. If it is still not satisfied, continue to increase the number of nodes until the GTS request request is met. Then, the network coordinator determines whether the requesting node and the selected shared node satisfy the GTS sharing requirement, and if so, the allocation requesting node shares the allocated GTS with the sharing node; otherwise, rejects the GTS request.
  • the network coordinator determines whether the requesting node and the selected shared node meet the GTS sharing requirement: the network coordinator extracts the burst length, the data arrival rate, and the delay requirement information of the service in the GTS request, according to the burst length of the service. The information obtains the service delay of the node that sends the GTS request and the shared node, and determines whether the service delay of the requesting node and the shared node is less than or equal to the respective delay requirement. If both are less than or equal to, the requesting node and the sharing are further determined. Whether the sum of the data arrival rates of the nodes is smaller than the relative bandwidth of the GTS allocated by the shared node, and if not, determining that the requesting node and the shared node satisfy the GTS sharing requirement.
  • the network coordinator After allocating the GTS for the node in the shared mode, the network coordinator broadcasts the GTS start and end time shared by the requesting node and the shared node and the manner of sharing the GTS to each node in the beacon frame of the next superframe.
  • the requesting node and the sharing node can share and use the allocated GTS to send data.
  • the GTS may be used alternately in each of two adjacent superframes to transmit data; or, three consecutive superframes may be regarded as a group, and GTSs in consecutive two superframes are allocated to the requesting node. The remaining one is assigned to the shared section Point; or, assign the GTS in two consecutive superframes to the shared node, and the remaining one is assigned to the requesting node.
  • the distribution method is not fixed and needs to be determined according to the actual situation.
  • the network coordinator may further include: determining, by the network coordinator, whether there is a time slot that is not occupied by other nodes, and if yes, assigning the unoccupied time slot The requesting node is then allocated a GTS time slot for the requesting node according to the sharing mode; of course, if there is no time slot resource that is not occupied by other nodes, the network coordinator directly allocates the GTS time slot to the requesting node according to the sharing mode.
  • This step considers that although the remaining time slots of the current super frame cannot satisfy the number of time slots allocated in the GTS request, it does not mean that there are no remaining time slots in the current super frame, for example, the remaining one in the current super frame.
  • Time slot, and the GTS request requires allocation of two time slots, then, for this case, the network coordinator may choose to first allocate the remaining one time slot to the requesting node, and then allocate the required requesting node according to the sharing mode. Another time slot.
  • the network coordinator may further include: the network coordinator determines whether the requesting node is allowed to share according to the sharing.
  • the GTS allocation mode allocates a GTS time slot for it.
  • the specific judgment method is: The network coordinator reads the allocation type field information in the GTS request, and if the field is set to allow the network coordinator to allocate the GTS time slot according to the shared GTS allocation manner, for example, setting If 1, the network coordinator allocates a GTS slot to the requesting node according to the shared GTS allocation manner; otherwise, the network coordinator rejects the GTS request.
  • the network coordinator may further include: determining, by the network coordinator, whether the selected sharing node allows the requesting node to share the GTS to which it is allocated, if not allowed, Reselect the shared node.
  • the judgment mode and the network coordinator determine whether the requesting node is allowed to allocate the same GTS time slot according to the shared GTS allocation manner, and details are not described herein.
  • 3 is a flow chart of an embodiment of a method of the present invention. As shown in Figure 3, the following steps are included:
  • Step 301 The network coordinator receives the GTS request from the node.
  • Step 302 The network coordinator determines whether the remaining time slot in the current superframe that can be used for the GTS allocation can meet the GTS request requirement. If yes, go to step 303; otherwise, go to step 304.
  • the judging method is: The network coordinator judges whether the remaining slots in the current superframe can be used for GTS allocation, that is, whether the number of slots not occupied by the GTSs of other nodes satisfies the number of slots allocated by the GTS request.
  • Step 303 The network coordinator allocates a GTS time slot to the Node B according to the existing GTS allocation manner, and ends the process.
  • the network coordinator allocates a corresponding time slot to the node B according to the GTS request request, and broadcasts the GTS start time allocated to the node B to each node in the network in the beacon frame of the next super frame.
  • FIG. 4 is a schematic diagram of Node B transmitting data by using the allocated GTS according to an embodiment of the present invention. As shown in Fig. 4, assuming that the 16th time slot is assigned to Node B as a GTS, then in successive N superframes, Node B can use the allocated GTS to transmit data until the data is transmitted. Before Node B sends the data, the GTS is directly assigned to Node B, and other nodes cannot use it to send data.
  • Step 304 The network coordinator determines whether the node B is allowed to allocate a GTS time slot according to the shared GTS allocation manner. If yes, step 305 is performed; otherwise, step 307 is performed.
  • the judgment mode is: the network coordinator extracts the allocation type field information in the GTS request sent by the node B, and if the allocation type field is set to 1, it determines that the node B allows the network coordinator The GTS time slot is allocated according to the shared GTS allocation mode; otherwise, it is determined not to be allowed.
  • Step 305 The network coordinator determines whether the node B satisfies the GTS sharing requirement. If yes, step 306 is performed; otherwise, step 307 is performed.
  • the network coordinator determines whether the node B satisfies the GTS sharing requirement: the network coordinator extracts the burst length, the data arrival rate, and the delay requirement information of the service in the GTS request; and obtains the burst length information according to the service.
  • the sum of the data arrival rates is less than the GTS relative bandwidth allocated by the shared node. If less, the node B is determined to satisfy the GTS sharing requirement.
  • the network coordinator has allocated all the time slots in the current superframe that can be used for GTS allocation to several nodes that have sent GTS requests before the node B. Then, if the node B wants to send data, it can only The assigned GTS is shared with other nodes that have assigned GTS slots.
  • the network coordinator first calculates the GTS utilization of each node that has been allocated to the GTS, and selects the node with the lowest GTS utilization as the node to be GTS shared with the node B.
  • the GTS utilization rate of each node is calculated as: Calculate the ratio of the amount of data actually generated by each node in a BI to the amount of data that the GTS can actually transmit.
  • the actual amount of data that GTS can transmit is 10 kbps, and the actual amount of data generated by a node during the GTS time period is only 5 kbps, and the GTS utilization rate of the node is 50%.
  • the calculations can utilize existing technology.
  • FIG. 5 is a schematic diagram of a data arrival curve of the node A in the embodiment of the present invention.
  • the network coordinator can calculate the amount of data actually generated by the node A in the time corresponding to the GTS, and then obtain the GTS utilization rate of the node A.
  • the amount of data actually generated by the node A is the integral value of the data arrival curve 501 corresponding to the time line 502.
  • the network coordinator can calculate the GTS utilization of other nodes that have been assigned to the GTS.
  • the final calculation result of H ⁇ shows that the GTS utilization of node A is the lowest, then the network coordinator selects node A to perform GTS sharing with node B.
  • the network coordinator can also calculate the service delay of node A according to the information reported by node A, as shown in formula (3):
  • C is the channel capacity; ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ) ⁇ less than 200ms, it can be seen that node A can use the allocated GTS to send data.
  • the network coordinator judges whether the node ⁇ can share the GTS of the node ⁇ according to the node 1 and the node 1 and the information, and assumes that the br and max of the node B are 400 bits 2 kbps and 150 ms, respectively, and the node A
  • the allocated GTS occupies only one time slot, and its relative bandwidth is 10 kbps.
  • the network coordinator further determines whether the sum of the data arrival rates of the node A and the node B is smaller than the relative bandwidth of the GTS allocated by the node A, because the data arrival rates of the node A and the node B in this embodiment are 4 kbps and 2 kbps, respectively.
  • the sum is 6 kbps, which is smaller than the relative bandwidth of the GTS by 10 kbps. Therefore, the Node B can share the GTS allocated by the node A with the node A.
  • Step 306 The network coordinator allocates a GTS slot to the Node B according to the GTS sharing mode.
  • the network coordinator allocates the GTS allocated by the node A to the node B.
  • the network coordinator broadcasts the GTS start and end time allocated for Node B to each node through the beacon frame in the next superframe, and specifies how Node B and Node A share the GTS. For example, it may be that two nodes in the adjacent superframe use the GTS to transmit data in turn.
  • Node B can share the GTS transmission data with Node A according to the allocated GTS.
  • FIG. 6 is a schematic diagram of Node B and Node A sharing the same GTS according to an embodiment of the present invention. For convenience of description, only one GTS, that is, the GTS shared by Node B and Node A, is shown in FIG. 6. In different superframes, Node A and Node B alternately use the GTS to transmit data.
  • Step 307 The network coordinator rejects the GTS request and ends the process.
  • the network coordinator can allocate the node B to simultaneously share the GTS with the two nodes. If the two nodes still do not meet the requirements, the analogy can be pushed to further increase the shared GTS.
  • Judge The manner in which the Node B can share the GTS with other nodes is the same as the method for determining whether the Node B and the Node A can share the GTS as described above, and details are not described herein again.
  • the present invention is not limited to only two nodes sharing the same GTS. According to actual needs, three or more nodes may share the same GTS, but the GTS sharing requirement must be met.
  • the network coordinator allocates the GTS for the Node B, it also receives the GTS request from the Node C. Similarly, the network coordinator allocates the GTS slot to the Node C according to the shared mode. Assuming that the GTS with the lowest utilization rate is still the GTS shared by Node A and Node B, the network coordinator will first determine whether Node C can implement GTS sharing with Node A and Node B. Assuming that the nodes (!, r, and ) max are 800 bits 3 kbps and 500 ms, respectively, the service delays of nodes AB and C can be calculated according to formula (5):
  • FIG. 7 is a schematic diagram of three nodes sharing the same GTS according to an embodiment of the present invention. As shown in FIG. 7, three nodes may use the allocated GTS in turn.
  • the network coordinator can flexibly select, according to the actual situation, which node or nodes that have sent the GTS request have been assigned to the GTS node. GTS shares, and it is flexible to determine that several nodes share the same GTS as long as the sharing requirements are met.
  • FIG. 8 is a schematic diagram of a comparison between the existing GTS allocation mode and the improved GTS allocation mode of the present invention, that is, the GTS utilization ratio in the shared GTS allocation mode.
  • the data shown in Fig. 8 is obtained under the condition that the duty ratio is equal to 0.5 and SO is equal to zero.
  • the GTS utilization rate is the average of the individual GTS utilizations:
  • the line 801 represents the GTS utilization rate in the existing GTS allocation mode
  • the curve 802 represents the GTS utilization rate in the improved GTS allocation mode of the present invention.
  • the improved GTS allocation method of the present invention can significantly improve the utilization of GTS.
  • FIG. 9 is a schematic structural diagram of an apparatus according to an embodiment of the present invention.
  • the device includes at least: a first determining module 901 and a shared GTS allocating module 902.
  • the first determining module 901 is configured to receive a GTS request from the requesting node, and determine that the current superframe can be used for GTS allocation. Whether the remaining time slots satisfy the GTS request requirement;
  • the shared GTS allocation module 902 is configured to allocate, according to the shared GTS allocation manner, the requesting node, when the judgment result of the first determining module 901 is that the remaining time slots that can be used for GTS allocation in the current super frame cannot meet the GTS request requirement. GTS time slot.
  • FIG. 10 is a schematic structural diagram of a shared GTS allocation module according to an embodiment of the present invention.
  • the shared GTS allocation module 902 specifically includes a selection module 9021, a second determination module 9022, and an allocation module 9023.
  • the selecting module 9021 is configured to: when the judgment result of the first determining module 901 is that the remaining time slots that can be used for GTS allocation in the current super frame cannot meet the GTS request requirement, the node that has already allocated the GTS time slot from the current Select a shared node that will be GTS shared with the requesting node;
  • the second determining module 9022 is configured to determine whether the shared node selected by the requesting node and the selecting module 9021 meets the GTS sharing requirement;
  • the allocating module 9023 is configured to: when the judgment result of the second judging module 9022 is that the requesting node and the sharing node meet the GTS sharing requirement, allocate the GTS of the sharing node to the node that initiates the GTS request according to the sharing manner; otherwise, reject the GTS request.
  • the shared GTS allocation module 902 specifically includes a third determining module 9024, a selecting module 9021, a second determining module 9022, and an allocating module 9023;
  • the third judging module 9024 is configured to: when the judgment result of the first judging module 901 is that the remaining time slots that can be used for the GTS allocation in the current super frame cannot satisfy the GTS request request, determine, according to the GTS request, whether the requesting node allows Network Coordinator is allocated according to shared GTS The mode assigns a GTS time slot to it, and if so, notifies the selection module 9021 to select the shared node; otherwise, rejects the GTS request;
  • the selecting module 9021 is configured to select, from the nodes that have currently allocated the GTS time slot, a shared node to be GTS shared with the requesting node;
  • the functions of the second judging module 9022 and the assigning module 9023 are the same as those previously described, and are not described again.
  • the network coordinator after receiving the GTS request sent by each node, the network coordinator adaptively selects different GTS allocation modes by considering factors such as network traffic and delay, thereby achieving high efficiency.
  • Reasonable allocation of network resources not only ensures the timely transmission of data in each node, but also greatly improves the utilization of GTS and optimizes network performance.

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Abstract

L'invention porte sur une méthode d'attribution de créneaux de temps garantis (GTS) selon laquelle: on recoit une demande de GTS d'un noeud demandeur; on détermine si les créneaux de temps restants utilisés pour l'attribution des GTS dans une supertrame actuelle ne satisfont pas aux conditions de la demande de GTS (201), on attribue les créneaux de temps GTS au noeud demandeur selon un mode d'attribution partagé du GTS (203); sinon, on attribue les créneaux de temps GTS selon un mode d'attribution existant du GTS. L'invention porte également sur un dispositif d'attribution de GTS.
PCT/CN2007/071406 2007-03-20 2007-12-29 Méthode et dispositif d'attribution de créneaux de temps garantis WO2008113243A1 (fr)

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