CN101494520B - Method for dynamically regulating wireless link control protocol data cell size - Google Patents
Method for dynamically regulating wireless link control protocol data cell size Download PDFInfo
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- CN101494520B CN101494520B CN200810065962XA CN200810065962A CN101494520B CN 101494520 B CN101494520 B CN 101494520B CN 200810065962X A CN200810065962X A CN 200810065962XA CN 200810065962 A CN200810065962 A CN 200810065962A CN 101494520 B CN101494520 B CN 101494520B
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Abstract
The invention relates to a dynamic adjustment method for the dimension of a data unit of a wireless link control protocol in a wideband code division multiple access system. The method comprises the following steps of: firstly configuring 1E/1F event measuring threshold on user terminal equipment and configuring a value of the maximum dimension of the data unit of the wireless link control protocol corresponding to the 1E/1F event; and then determining that whether the current value of the dimension of the data unit of the wireless link control protocol is modified by judging the types of the events reported by the user terminal equipment and judging the current value of the dimension of the data unit of the wireless link control protocol. The invention adjusts the maximum value of the dimension of the data unit of the flexible wireless link control protocol according to the wireless channel quality, thus not only retaining the advantages of the dimension of the data unit of the flexible wireless link control protocol, but also avoiding the problem that the retransmission efficiency of data packet with large dimension is low under the condition of poor wireless environment and improving the system performance and the utilization ratio of code resources.
Description
Technical field
The present invention relates to the communications field, be particularly related to Wideband Code Division Multiple Access (WCDMA) (Wideband Code DivisionMultiple Access, WCDMA) a kind of Radio Link control (Radio Link Control in the system, RLC) protocol Data Unit (Protocol Data Unit, PDU) dynamic adjusting method of size.
Background technology
In 3G (Third Generation) Moblie, (Radio Bearer, (Acknowledged Mode, AM), the re-transmission mode of the ACK/NACK by rlc layer is for business provides a kind of reliable transmission service to radio bearer RB) to be controlled to be affirmation mode in the agreement of rlc layer.
RLC AM pattern, the transmission of the pattern control downlink data by send window, therefore, the downlink data bandwidth is restricted by following formula:
Rate＝Window?size*PDU?Size/RTT (1)
Wherein Window size is the send window size, and PDU Size is the PDU size, and RTT is that network is returned delay.
In order to guarantee a kind of reliable transmission, in the operation of reality, the send window size can not surpass half of maximum send window of protocol definition, i.e. 2048 (the maximum send window of protocol definition is 4096).The window renewal of considering RLC AM pattern is influenced by the status report mechanism of receiving terminal also, and therefore, the bandwidth formula is modified to:
Rate＝2048*PDU?Size/(RTT+SPT) (2)
Wherein SPT is that status report is forbidden timer.
Therefore, under the situation that send window, RTT and SPT fix, data bandwidth is just only relevant with the size of RLC PDU, as shown in Table 1, 2 and 3:
Table 1
Table 2
Table 3
As can be seen from the table, large-sized PDU can effectively improve data bandwidth.Therefore, (Third Generation Partnership Project 3GPP) in the agreement of R7 version, has proposed a kind of PDU of RLC flexibly size method to the 3G (Third Generation) Moblie tissue, be flexible RLC PDU, to replace the method for the fixedly RLC PDU size of version before.Introduce the method for flexible RLC PDU size, for the efficient that improves Network Transmission, reduce of the influence of data packet head expense to efficient, tool has very important significance, flexibly the method for RLC PDU size and fixedly the method for RLC PDU size to the influence of header overhead, as illustrated in fig. 1 and 2.Wherein Fig. 1 is the increase along with the IP packet size, the shared ratio schematic diagram of header overhead, as can be seen from the figure, increase along with the IP packet size, fixed dimension PDU and Flexible size PDU converge on 10% and 0% respectively, still, and when the size of IP packet is smaller, the method of fixed dimension PDU, header overhead have accounted for very big ratio.Fig. 2 is fixed dimension PDU and the actual header overhead of Flexible size PDU method and fills bit and count schematic diagram that as can be seen from the figure, along with the increase of IP packet, the header overhead of fixed dimension PDU and filling bit number are also along with increase.
The method of flexible RLC PDU size, the upper limit MAX RLCPDU Size of a RLC PDU Size promptly only is set, the size of actual RLC PDU bag, service data unit (the Service Data Unit that receives according to the rlc protocol layer, SDU) size is determined, if MAX RLC PDU were Size＞=SDU Size, RLC PDU Size=SDU Size+ header overhead so, if MAX RLC PDU were Size＜SDU Size, RLC PDU Size=MAX RLC PDU Size+ header overhead so.
The agreement regulation, for RLC PDU Size pattern flexibly, only insert (HighSpeed Packet Access in the enhanced high-speed grouping, HSPA+) use under the pattern, this has just introduced a problem: for bigger SDU Size, actual RLC PDU Size is just bigger, so in the relatively poor zone of wireless environment, large-sized packet retransmission efficiency can be well below undersized packet, wherein, the measurement of wireless environment quality can obtain by the 1E/1F measurement in 3GPP 25.211 agreements.
Summary of the invention
Technical problem to be solved by this invention is, a kind of dynamic adjusting method of RLC PDU size is provided, the advantage of the flexible RLC PDU Size that this method had both kept, avoided again under the situation of wireless environment difference, the problem that the retransmission efficiency of large-sized packet is low is with performance and the sign indicating number resource utilization that improves system.
A kind of dynamic adjusting method of RLC PDU size may further comprise the steps:
Steps A: the configure user terminal equipment (User Equipment, UE) 1E and 1F affair thresholding, and UE 1E and 1F affair report mode to be set to the reporting events mode;
Step B: value MaxRlcPduSize1 and the MaxRlcPduSize2 of the maximum RLC PDU Size of configuration 1E and 1F incident correspondence;
Step C: judge the event type that UE reports, and judge whether the value of the current RLC PDU of reported event Size equals the value of maximum RLC PDU Size,, then revise the value of current RLC PDU Size if be not equal to; Otherwise flow process finishes.
Described step C specifically comprises step:
C1: judge the event type that UE reports, if UE reports is the 1F incident, execution in step C2 then, if UE reports is the 1E incident, execution in step C3 then;
C2: judge whether current RLC PDU Size equals MaxRlcPduSize1,, then current RLC PDU Size is revised as MaxRlcPduSize1 if be not equal to; Otherwise flow process finishes;
C3: judge whether current RLC PDU Size equals MaxRlcPduSize2, as be not equal to, then current RLC PDU Size is revised as MaxRlcPduSize2; Otherwise flow process finishes.
The value of described MaxRLcPduSize1 is less than the value of MaxRLcPduSize2.
The measurement threshold value of described 1E incident is-12 decibels (db).
The measurement threshold value of described 1F incident is-14db.
The value of described MaxRlcPduSize1 is 80 bytes (bytes).
The value of described MaxRlcPduSize2 is 1500bytes.
Adopt method of the present invention, maximum according to the flexible RLC PDU of quality of wireless channel adjustment Size, the advantage that had both kept flexible RLC PDU Size, avoided again under the situation of wireless environment difference, the problem that the retransmission efficiency of large-sized packet is low is with performance and the sign indicating number resource utilization that improves system.
Description of drawings
Fig. 1 RLC head and filling expense contrast schematic diagram;
Fig. 2 RLC head and filling expense accumulative total contrast schematic diagram;
Fig. 3 the method for the invention flow chart.
Embodiment
The present invention is described in further detail below in conjunction with accompanying drawing.
As described in Figure 3, be the method for the invention flow chart, comprise step:
1, open UE 1E and 1F and measure, it is the reporting events mode that allocating and measuring reports mode;
2, configuration 1E thresholding is-12db, and configuration 1F thresholding is-14db;
3, configuration MaxRlcPduSize1=80bytes, configuration MaxRlcPduSize2=1500bytes;
4, judge the event type that UE reports, if UE reports is the 1F incident, then execution in step 5, if UE reports is the 1E incident, then execution in step 6;
5, judge whether current RLC PDU Size equals MaxRlcPduSize1,, then current RLC PDU Size is revised as MaxRlcPduSize1 if be not equal to; Otherwise flow process finishes;
6, judge whether current RLC PDU Size equals MaxRlcPduSize2, as be not equal to, then current RLC PDU Size is revised as MaxRlcPduSize2; Otherwise flow process finishes.
Claims (7)
1. the dynamic adjusting method of a wireless link control protocol data cell size is characterized in that, may further comprise the steps:
Steps A: configure user terminal equipment 1E and 1F affair thresholding, and subscriber terminal equipment 1E and 1F affair report mode to be set to the reporting events mode;
Step B: the value of the maximum wireless LCP data cell size of configuration 1E and 1F incident correspondence;
Step C: judge the event type that subscriber terminal equipment reports, and whether the value of judging reported event current wireless LCP data cell size equals the value of maximum wireless LCP data cell size, if be not equal to, then revise the value of current wireless LCP data cell size; Otherwise flow process finishes.
2. the dynamic adjusting method of wireless link control protocol data cell size as claimed in claim 1 is characterized in that, described step C specifically comprises step:
C1: judge the event type that subscriber terminal equipment reports, if subscriber terminal equipment reports is the 1F incident, execution in step C2 then, if subscriber terminal equipment reports is the 1E incident, execution in step C3 then;
C2: judge whether current wireless LCP data cell size equals the maximum wireless LCP data cell size of 1F incident correspondence, if be not equal to, then current wireless LCP data cell size is revised as the maximum wireless LCP data cell size of 1F incident correspondence; Otherwise flow process finishes;
C3: judge whether current wireless LCP data cell size equals the maximum wireless LCP data cell size of 1E incident correspondence, as be not equal to, then current wireless LCP data cell size is revised as the maximum wireless LCP data cell size of 1E incident correspondence; Otherwise flow process finishes.
3. the dynamic adjusting method of wireless link control protocol data cell size as claimed in claim 1 or 2, it is characterized in that the value of the maximum wireless LCP data cell size of described 1F incident correspondence is less than the value of the maximum wireless LCP data cell size of described 1E incident correspondence.
4. the dynamic adjusting method of wireless link control protocol data cell size as claimed in claim 1 or 2 is characterized in that, the measurement threshold value of described 1E incident is-12 decibels.
5. the dynamic adjusting method of wireless link control protocol data cell size as claimed in claim 1 or 2 is characterized in that, the measurement threshold value of described 1F incident is-14 decibels.
6. the dynamic adjusting method of wireless link control protocol data cell size as claimed in claim 1 or 2 is characterized in that, the value of the maximum wireless LCP data cell size of described 1F incident correspondence is 80 bytes.
7. the dynamic adjusting method of wireless link control protocol data cell size as claimed in claim 1 or 2 is characterized in that, the value of the maximum wireless LCP data cell size of described 1E incident correspondence is 1500 bytes.
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