WO2007093078A1 - Procédé de détermination de taille de fenêtre glissante dans un système de communications mobile sans fil - Google Patents

Procédé de détermination de taille de fenêtre glissante dans un système de communications mobile sans fil Download PDF

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Publication number
WO2007093078A1
WO2007093078A1 PCT/CN2006/000220 CN2006000220W WO2007093078A1 WO 2007093078 A1 WO2007093078 A1 WO 2007093078A1 CN 2006000220 W CN2006000220 W CN 2006000220W WO 2007093078 A1 WO2007093078 A1 WO 2007093078A1
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WO
WIPO (PCT)
Prior art keywords
sliding window
window size
current
time slots
target
Prior art date
Application number
PCT/CN2006/000220
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English (en)
Chinese (zh)
Inventor
Jihong Wang
Xue Tang
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Zte Corporation
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.)
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Publication date
Application filed by Zte Corporation filed Critical Zte Corporation
Priority to CN2006800077632A priority Critical patent/CN101138260B/zh
Priority to PCT/CN2006/000220 priority patent/WO2007093078A1/fr
Publication of WO2007093078A1 publication Critical patent/WO2007093078A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W99/00—Subject matter not provided for in other groups of this subclass

Definitions

  • This invention relates to mobile wireless communication systems and, more particularly, to a method of determining a variable sliding window size in an Enhanced General Packet Radio Service (EGPRS) system.
  • EGPRS Enhanced General Packet Radio Service
  • General Packet Radio Service GPRS is a GSM-based wireless packet switching technology that provides end-to-end, wide-area wireless IP connectivity and is a transitional technology for the transition from existing GSM networks to third-generation mobile communication networks.
  • the GPRS system transmits data in packets and uses a sliding window mechanism to implement flow control.
  • the size of the sliding window is fixed at 64. Since the size of the sliding window is fixed and the system is fixed, the stronger the multi-slot capability of the mobile station, the more likely the window stagnation occurs during data transmission. In addition, the fixed size of the sliding window makes the smoothness of data transmission limited, and the problem of window stagnation is obvious.
  • Enhanced GPRS is a further improvement of GPRS, which significantly improves the transmission speed of packet data and improves the window stagnation in the above GPRS system.
  • the size of the sliding window can vary with the number of multi-slots.
  • the range between the size of the sliding window and the number of time slots is given, but no specific details are given on how to determine the size of the sliding window. Therefore, there is a need to propose a method of determining the size of a sliding window in an EGPRS system. Summary of the invention
  • the present invention has been made in view of the above technical problems, and an object thereof is to provide a method for determining a sliding window size in a mobile radio communication system, which method is determined by factors such as number of slots, channel coding mode, window stagnation, and wireless environment.
  • Reasonable sliding window size reduces the chance of window stagnation and ensures fast and stable transmission performance.
  • a method of determining a sliding window size in a mobile wireless communication system includes the following steps: According to the relationship between the number of time slots and the size of the sliding window, the current sliding window size is determined by the current number of time slots;
  • a set of the number of time slots that can be applied in the range from the current number of time slots to the number of target time slots is calculated.
  • the size of the sliding window actually allocated to the number of target time slots is determined; otherwise, the current sliding window size is maintained.
  • the method further includes:
  • the method further includes:
  • the target channel coding mode is MCS7, MCS8 or MCS9;
  • the target channel coding mode is lower than the current channel coding mode, check whether the current channel coding mode is MCS7, MCS8 or MCS9 and the target channel coding mode is decreased by two levels; if yes, the actual allocated sliding window size is determined;
  • the method of the invention dynamically determines the sliding window size according to a specific transmission situation, on the one hand
  • the system memory and processing overhead are reduced, and on the other hand, the stable and fast transmission of data blocks is guaranteed.
  • the method of the present invention considers the next increased space after the sliding window size is increased in determining the actually allocated sliding window size, instead of simply selecting the minimum or maximum allowable sliding window size, thereby ensuring dynamic adjustment of the sliding window size. flexibility.
  • the method of the present invention not only considers the effect of the number of time slots on the size of the sliding window, but also the effects of window stall, channel coding, and wireless environment. Using the method of the present invention to determine the size of the sliding window
  • FIG. 1 is a flow chart of a method of determining a size of a sliding window in a mobile wireless communication system in accordance with a first embodiment of the present invention
  • FIG. 2 is a flow chart of a method of determining a sliding window size in a mobile wireless communication system in accordance with two embodiments of the present invention
  • FIG. 3 is a flow chart of a method of determining a sliding window size in a mobile wireless communication system in accordance with a third embodiment of the present invention. detailed description
  • FIG. 1 is a flow chart of a method of determining a sliding window size in a mobile wireless communication system in accordance with a first embodiment of the present invention.
  • this embodiment Considering the change in the number of allocated time slots, the sliding window size is dynamically changed according to the corresponding range table of the sliding window size and the number of time slots recommended by the EGPRS protocol. Moreover, this embodiment follows the following principles:
  • the EGPRS protocol specifies a range of sliding window sizes corresponding to the number of different time slots, and a table of corresponding ranges of the sliding window size and the number of multi-slots is recommended, as shown in Table 1, wherein the gray portion corresponds to a certain number of slots.
  • Table 1 The allowable range of sliding window sizes.
  • the current sliding window size is determined. If the mobile terminal does not have the multi-slot capability, the current sliding window size is 64. If the mobile terminal reports the multi-slot capability, the relationship between the number of slots and the size of the sliding window is determined. For example, the relationship table shown in Table 1, the current sliding window size is determined by the current number of slots.
  • the current sliding window size may be determined as any one of the allowed sliding window sizes corresponding to the current number of time slots, i.e., any sliding window size within the gray portion of Table 1.
  • the current sliding window size may be determined as the minimum allowable sliding window size corresponding to the current number of time slots.
  • the current number of time slots is N.
  • the number of target time slots is ⁇
  • the current sliding window size is W n .
  • the sliding window size actually allocated to the number of target slots is W all .
  • the current sliding window size W n is W n .
  • the row number of table 1 corresponding to w is L nw
  • Table 1 can be represented by the array atbyWinsizeTs [i][j], where i represents the sliding window size type (ie, line number) and 1 ⁇ ⁇ ⁇ 32 j represents the number of allocated time slots and l ⁇ j ⁇ 8. If the jth column of the i-th row of the array is in the gray part of Table 1, there is atbyWinsizeTs[i]
  • step 105 the number of target slots is compared ⁇ and the number of current slots N nw
  • each is not less than the current sliding window size W n .
  • the sliding window size of w is calculated from the current number of slots N n .
  • the number of sliding window sizes that can be applied to the number of slots in the range of w to the number of target slots N all0 c is Ni. That is, specifically, for each row i, L now ⁇ i ⁇ 32, the number of Ni is calculated as follows:
  • the line Li having the maximum value of the number j is recorded into the array atbyMaxLNo[32].
  • the number of target time slots N all is recorded.
  • the upper limit value of the sliding window size W max and the lower limit value ⁇ are recorded. Specifically, first, according to Table 1, check whether the sliding window size corresponding to the largest line number in the array atbyMaxLNo[32] is applicable. The number of target time slots N all c ; if yes, the upper limit value W max of the sliding window size is recorded as the sliding window size corresponding to the largest line number; if not, the upper limit value W max of the sliding window size is recorded The minimum allowable sliding window size corresponding to the number of target time slots N all e . Then, record the lower limit of the sliding window size The sliding window size that can be applied to the current number of slots corresponding to the smallest row number in the array atbyMaxLNo[32].
  • step 117 determines whether the current sliding window size W nQW is the minimum allowable sliding window size corresponding to the target number of slots N all vom c . If yes, then in step 118, it is determined that the actual allocation to the target is made. the number of gap sliding window size W all e aIl0C target slot number N all c corresponding to the minimum permissible sliding window size;.
  • the array is checked atbyMaxLNo [32] whether a line number only if array atbyMaxLNo [32 ⁇ only a line number, then in step 120, to determine the actual number of slots allocated to the target slip window size W aH. e corresponding to the line number that can be applied to the target slot number N all. e If there are multiple line numbers in the array atbyMaxLNo[32], in step 121, calculate the current sliding window size W whoow multiplied by the number of target slots N all . e and the current number of time slots N n . The ratio of w , that is, the calculation of W n .
  • step 123 the sliding window size W all actually assigned to the number of target slots.
  • e is determined to be only lower than W n in Table 1.
  • w *(N All .e /N n()W ) and not less than the lower limit of the sliding window size The sliding window size that can be applied to the number of target slots N all0C . If W now *(N a , ioc / N now ) W max is satisfied, then in step 124, the sliding window size W alloc actually assigned to the target number of slots is determined as the upper limit value W max of the sliding window size.
  • step 130 it is determined whether the current sliding window size W stomach exceeds the target number of time slots N all .
  • the maximum allowable sliding window size corresponding to e in case If so, in step 132, a new sliding window size W all is reassigned. c , you can determine the new sliding window size W all . e is the destination slot number N a "oc sliding window corresponding to the maximum allowable size. If not, then in step 135, to keep the current sliding window size W n. w unchanged.
  • the sliding window size can be determined according to the change of the number of time slots, and the current sliding window size is considered in the determining process.
  • the sliding window size is increased, the sliding window size is changed after the time slot is changed.
  • the adjustment of the size of the sliding window is maximized and flexible. If the minimum window size is always used, the advantage of the window size range cannot be exerted, and the data transmission efficiency may be affected. If the maximum window size is always used, the content that needs to be cached in the communication system will increase, and there is a large amount of data. In the case of business, the cost of the entire system will increase. Therefore, with the embodiment, not only the overhead of system memory and processing but also the stable and fast transmission of the data block can be ensured.
  • FIG. 2 is a flow chart of a method of determining a sliding window size in a mobile wireless communication system in accordance with two embodiments of the present invention.
  • this embodiment mainly considers the factor of window stagnation when determining the size of the sliding window. It should be noted that if the number of time slots changes, the number of time slots is the most important factor in determining the size of the sliding window, and window stagnation is an optional factor; if the number of time slots does not change, window stagnation is a major factor. Since the above description has discussed how to determine the size of the sliding window based on the number of time slots, only the effect of window stagnation on determining the size of the sliding window will be described in detail herein.
  • step 201 the window stagnation threshold N ch is set .
  • step 205 the number of window stops N sta is counted.
  • step 207 the window stop number N sta and the window stagnation threshold N ch are compared. If the window stop count N sta exceeds the window stagnation threshold N ch , then in step 210, the sliding window size is increased to obtain a new sliding window size ⁇ . . , and Set the number of window stops N sta . Otherwise, return to step 205
  • W n is here.
  • W w uses W all determined according to the number of time slots. c instead.
  • FIG. 3 is a flow chart of a method of determining a sliding window size in a mobile wireless communication system in accordance with a third embodiment of the present invention.
  • this embodiment mainly considers factors in which the channel coding mode is changed. It should be noted that in the case where the number of time slots changes, the channel coding mode change and the window stagnation are mutually independent optional factors; and in the case where the number of time slots does not change, the channel coding mode change and the window stagnation are independent of each other. The main factor in the choice of the two. Since the above description has discussed the number of time slots and the factor of window stagnation, only the factors that change the channel coding mode are explained here.
  • the channel coding mode is MCS7 MCS8 or MCS9
  • one radio block has two radio link control (RLC) blocks, so the window is sent quickly, and the window size is required to be appropriately increased.
  • RLC radio link control
  • the window size is increased.
  • the wireless environment deteriorates, for example, when the channel coding mode is changed from MCS9 to MCS3 or MCS6, it is confirmed that the state variable V(A) is not likely to move, and the window size should be increased in order to improve performance.
  • Table 2 shows the effect of channel coding mode changes on the size of the sliding window.
  • V(A) considering the transmission state variable V(S) Channel coding method is improved (from the MCS3 window size, the window size is increased or MCS6 is increased to MCS9)
  • Reduced channel coding mode (increasing the window size from MCS9 window size to MCS3 or MCS6) As shown in FIG. 3, in step 301, if the channel coding mode is changed, the current channel coding mode is recorded as MCS. Ld , the target channel coding mode is MCS new , and the target channel coding mode MCS new and the current channel coding mode MCS are compared. Ld .
  • step 305 it is checked whether the target channel coding mode MCS new is MCS7, MCS8 or MCS9. If so, you need to determine the actual assigned sliding window size W all . e ; if not, then at the step
  • the target channel coding mode] ⁇ 1 €8 1 ⁇ is one of] ⁇ 1 €87, MCS8 or MCS9
  • a threshold is added to prevent the socks from changing frequently. Since the Temporary Block Flow (TBF) may occupy multiple time slots, and the channel coding mode is embodied in the time slot, the actual allocated sliding window size W all needs to be determined for different time slots. c .
  • the sliding window size W all is determined as described below.
  • the step of e can be calculated over a predetermined counting time period and adjusted in conjunction with the number of counts.
  • V t represents the target conversion value of a certain temporary block flow TBF on all channels
  • V s represents the source conversion value of the TBF on all channels
  • W n represents the current sliding window size
  • ⁇ represents the actual assigned sliding window size
  • W all represents the actual assigned sliding window size
  • w _ max represents the maximum allowable sliding window size corresponding to the current number of slots.
  • the target conversion value V t of the TBF on all channels can be determined as follows:
  • V ti 0, if there is no i-th channel in the channel allocation for the TBF;
  • V ti l, if there is an ith channel in the channel allocation of the TBF and the target channel coding mode is any one of MCS1 ⁇ MCS6;
  • V ti 2 if there is an ith channel in the channel allocation for the TBF and the target channel coding mode is any one of MCS7 ⁇ MCS9.
  • the source conversion value V s of the TBF on all channels can be determined as follows:
  • V si 0, if there is no ith channel in the channel allocation for the TBF;
  • V si l, if there is an i-th channel in the channel allocation of the TBF and the source channel coding mode is any one of MCS1 ⁇ MCS6;
  • V si 2 if there is an ith channel in the channel allocation for the TBF and the source channel coding mode is any one of MCS7 - MCS9.
  • step 315 the temporary block flow ratio of the target conversion value of all channels 1 ⁇ 4 conversion value V s of the source is calculated, then at step 316, calculation function floor (W nw * (V t / V s ).
  • the value of the function floor(parameter) is a function for calculating the largest integer not larger than the parameter parameter.
  • step 317 the value of the function floor(W nw * (V t /V s )) and W all are set .
  • w _ max is compared if floor(W nw * (V t /V s )) > W all .
  • the present invention can be applied to a mobile wireless communication system such as an EGPRS system.

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

Abstract

La présente invention concerne un procédé de détermination de taille de fenêtre glissante dans un système de communications mobile sans fil comprenant la détermination de la taille actuelle de la fenêtre glissante à partir du nombre d'intervalles actuels; si le nombre d'intervalles cibles est supérieur au nombre d'intervalles actuels, alors pour chaque taille des fenêtres glissantes qui n'est pas inférieure à la taille actuelle de fenêtre glissante, le calcul de l'ensemble du nombre d'intervalles auxquels chaque taille peut être appliquée dans la plage depuis le nombre d'intervalles actuels vers le nombre d'intervalles cibles; l'enregistrement de la limite supérieure et de la limite inférieure de la taille de la fenêtre glissante correspondant au nombre d'intervalles cibles; la détermination d'une nouvelle taille de la fenêtre glissante; si le nombre d'intervalles cibles est inférieur au nombre d'intervalles actuels, la détermination pour savoir si la taille actuelle de fenêtre glissante est supérieure à la taille maximale admise de fenêtre glissante correspondant au nombre d'intervalles cibles; dans l'affirmative, la détermination d'une nouvelle taille de fenêtre glissante; sinon, le maintien de la taille courante de la fenêtre glissante. La présente invention peut réduire la probabilité de stagnation de fenêtres et assurer une efficacité de transmission rapide et stable grâce à la détermination de taille raisonnable de fenêtre glissante en combinaison avec les facteurs tels que la quantité d'intervalles, le mode de codage de canal, la stagnation de fenêtre.
PCT/CN2006/000220 2006-02-14 2006-02-14 Procédé de détermination de taille de fenêtre glissante dans un système de communications mobile sans fil WO2007093078A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
CN2006800077632A CN101138260B (zh) 2006-02-14 2006-02-14 在移动无线通信系统中确定滑动窗口尺寸的方法
PCT/CN2006/000220 WO2007093078A1 (fr) 2006-02-14 2006-02-14 Procédé de détermination de taille de fenêtre glissante dans un système de communications mobile sans fil

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PCT/CN2006/000220 WO2007093078A1 (fr) 2006-02-14 2006-02-14 Procédé de détermination de taille de fenêtre glissante dans un système de communications mobile sans fil

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CN104796161B (zh) * 2015-04-01 2018-04-24 北京思朗科技有限责任公司 一种Turbo译码中的滑窗划分方法及装置

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CN1529437A (zh) * 2003-10-17 2004-09-15 中兴通讯股份有限公司 Wcdma系统无线网络控制层的流量控制方法
US20050013247A1 (en) * 2002-02-12 2005-01-20 Jussi Sipola Method for controlling data transmission, and data transmission system
WO2005117364A1 (fr) * 2004-05-31 2005-12-08 Nokia Corporation Procede de mise en oeuvre d'un protocole de transfert de donnees oriente connexion dans des reseaux de transmission sans fil

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CN1145327C (zh) * 2001-06-05 2004-04-07 华为技术有限公司 通用分组无线业务网络节点向计费网关发送话单的方法
CN100463427C (zh) * 2003-10-17 2009-02-18 中兴通讯股份有限公司 实现IPsec标准中不同安全终点的安全联盟嵌套方法

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20050013247A1 (en) * 2002-02-12 2005-01-20 Jussi Sipola Method for controlling data transmission, and data transmission system
CN1529437A (zh) * 2003-10-17 2004-09-15 中兴通讯股份有限公司 Wcdma系统无线网络控制层的流量控制方法
WO2005117364A1 (fr) * 2004-05-31 2005-12-08 Nokia Corporation Procede de mise en oeuvre d'un protocole de transfert de donnees oriente connexion dans des reseaux de transmission sans fil

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CN101138260A (zh) 2008-03-05

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