CN1866906A - Priority processing method for medium access control layer of third generation mobile communication system - Google Patents
Priority processing method for medium access control layer of third generation mobile communication system Download PDFInfo
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- CN1866906A CN1866906A CNA2005100706398A CN200510070639A CN1866906A CN 1866906 A CN1866906 A CN 1866906A CN A2005100706398 A CNA2005100706398 A CN A2005100706398A CN 200510070639 A CN200510070639 A CN 200510070639A CN 1866906 A CN1866906 A CN 1866906A
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Abstract
The invention discloses a third-generation mobile communication system medium switch-in control layer priority level treating method, which comprises the following steps: the wireless resource control layer distributes priority level for logic channel; MAC-d modular of medium switch-in control layer assigns weight value to priority level of channel and data delay level; MAC-d modular counts the delay time of every protocol data unit of logiccal communication channel; the priority level of logiccal communication channel is get according to the data delay time and weight value; the priority level is ranged according to the protocol data unit priority level; the data with the highest priority level is used for reference; the required sending data is treated and then sent by medium switch-in control layer.
Description
Technical field
The present invention relates to 3-G (Generation Three mobile communication system), especially relate to a kind of WCDMA (Wide-band Code Division Multiple Access System of system, broadband CDMA system) the middle MAC-d module of air interface protocol medium access control layer (Medium Access Control abbreviates MAC as) is to the priority scheduling processing method of many logic channels.
Background technology
As shown in Figure 1, in the WCDMA system, user plane protocol wireless chain control layer (RadioLink Control, abbreviate RLC as) and medium access control layer MAC not only need the business datum of transmission user, simultaneously also need to transmit the signaling message of high-rise radio resource control layer (Radio Resource Control abbreviates RRC as).Wherein, RLC cuts apart, is connected in series, fills and add operations such as sequence number to the data on upper strata, MAC to from or the data that mail to physical layer carry out multiplexing or demultiplexing, and carry out transformat combination (Transport FormatCombination according to the priority relationship of RRC indication, abbreviate TFC as) select, realize data dispatch etc.
MAC provides data transport service by logic channel for the upper strata, difference according to transmission information, logic channel can be divided into following several types: the Broadcast Control Channel (BCCH) of propagating broadcast, the Paging Control Channel (PCCH) of transmission beep-page message, propagate the Common Control Channel (CCCH) of public forward control information, propagate the CTCH Common Traffic Channel (CTCH) of public forward service information, the Dedicated Control Channel (DCCH) of the special-purpose control messages of transmission user, the Dedicated Traffic Channel (DTCH) of transmission user dedicated service data.And MAC provides data transport service by transmission channel for physical layer, and concrete transmission channel has: broadcast channel (BCH), and this channel and BCCH form mapping relations; Paging channel (PCH), this channel and PCCH form mapping relations; Descending forward access channel (FACH), up Random Access Channel (RACH), this channel can with CCCH, DCCH, DTCH forms mapping relations; Dedicated channel (DCH), this channel can with DCCH, DTCH forms mapping relations; Dedicated Shared CHannel (DSCH) or high-speed dedicated shared channel (HS-DSCH), they and DCCH, DTCH form mapping relations, as shown in Figure 2.Hence one can see that, and the critical function of MAC is exactly the mapping that realizes transmission channel and logic channel, thereby finish the transmission of data.
According to the difference of processing transmission channel, the MAC layer is divided into the MAC-b module, management BCH; The MAC-d module is mainly managed dedicated transmission channel; The MAC-c/sh module, managing common transmission channel and DSCH; The MAC-hs module, management HS-DSCH.Because a plurality of logic channels can be mapped to a transmission channel, and Common transport channel and DSCH, HS-DSCH can transmit a plurality of user's data, and complicated multiplexing relation is arranged among the MAC.Following several situation is specifically arranged: when a plurality of dedicated logical channel are mapped on a DCH or the HS-DSCH, have C/T multiplexing (a plurality of dedicated logical channel are mapped to the multiplexing of a transmission channel); Multiple logic channel (as CCCH, CTCH, when DTCH) being mapped to FACH and going up, there is TCTF multiplexing (be used to distinguish the type of common logical or whether dedicated logical channel) in DCCH; When the data map of a plurality of users' dedicated logical channel goes up to FACH, there is UEID multiplexing (being used to distinguish each user terminal).
For multiplexing data, MAC will carry out the priority transmission of data according to the priority relationship of RRC appointment, all need to carry out the processing of priority at MAC-d module, MAC-c/sh module and MAC-hs.The object that MAC-d module medium priority is handled has: many logic channels that are mapped to same DCH are carried out processed; The priority scheduling of many DCH; When having flow-control mechanism, a plurality of logic channels that are mapped to same Common transport channel priority or same MAC-d flow are carried out processed.In the MAC-c/sh module all source datas (as common logical and a plurality of user's data etc.) that are mapped to same Common transport channel are carried out processed.In the MAC-hs module all source datas that are mapped to same HS-DSCH are carried out the processing of priority.
For processed, 3GPP agreement (3GPP is the international organization that is called as " 3G (Third Generation) Moblie partner program ") is not done detailed description, only described the processed of UE (user terminal) side MAC when TFC selects in 3GPP 25.321V6.1.0: the priority of logic channel has absoluteness, and UE must the data that send the logic channel of high priority earlier as much as possible.But like this, existing problems: if the logic channel of high priority has data all the time, and the transmittability of transmission channel is limited, the data of low priority will be blocked in logic channel always so, surpass to a certain degree when the data delay time, can cause the failure or the upper strata RLC of flow process irrecoverable error to occur, so that logic channel is unavailable.
Summary of the invention
The technical issues that need to address of the present invention provide a kind of priority processing method of 3-G (Generation Three mobile communication system) medium access control layer, adopt this method can overcome and transmit lower-priority data generation blocking problem when frequent, thereby avoid the flow process failure at high-priority data.
In order to solve the problems of the technologies described above, the invention provides a kind of priority processing method of 3-G (Generation Three mobile communication system) medium access control layer, comprise the steps:
(a) radio resource control layer is each logical channel assignment priority according to the urgency level of transmission data; The MAC-d module is the priority and the data delay degree distribution weights of logic channel in the medium access control layer;
When (b) dispatching, MAC-d module statistics obtains the delay time of each protocol Data Unit in each logic channel at every turn;
(c) the MAC-d module is according to the priority of logic channel, and the priority weights of data delay time and logic channel and data delay degree weights in the logic channel calculate the priority of each protocol Data Unit;
(d) the MAC-d module sorts to each protocol Data Unit according to the protocol data unit priority that calculates, select the highest protocol Data Unit of priority as reference standard, data block to be sent such as obtain after the data that needs are sent are handled;
(e) ready data block in the medium access control layer control forwarding step (d).
Further, the present invention also has following characteristics, and described step (d) can be further divided into following steps:
(d1) the MAC-d module initialization is provided with the protocol data unit priority message queue;
(d2) the MAC-d module sorts to each protocol Data Unit from high to low according to the protocol data unit priority that calculates, and the precedence information of preserving each protocol Data Unit is to the protocol data unit priority message queue;
(d3) the MAC-d module is selected the protocol Data Unit identical with the highest protocol Data Unit length of the priority statistics that adds up, and the header that adds medium access control layer such as obtains at data block to be sent.
Further, the present invention also has following characteristics: the precedence information of preserving in the described step (d2) comprises priority, length and the affiliated logical channel number of protocol Data Unit.
Further, the present invention also has following characteristics: the formula that calculates protocol data unit priority in the described step (c) is
P
pdu(i，k)＝W
logi(8-P
logi)+W
TiT
i，k
Wherein, i presentation logic channel number, k are illustrated in the protocol Data Unit number in the logic channel, P
Pdu (i, k)The priority of k protocol Data Unit among the presentation logic channel i, P
LogiThe priority of presentation logic channel i, W
LogiThe priority weights of presentation logic channel i, T
I, kThe time of delay of k protocol Data Unit among the presentation logic channel i, W
TiThe data delay degree weights of presentation logic channel i.
Further, the present invention also has following characteristics: the priority limit of described logic channel is [1,8], and its medium priority is to represent that priority was the highest at 1 o'clock, is to represent that priority was minimum at 8 o'clock.
Further, the present invention also has following characteristics: the MAC-d module can be adjusted the priority weights and the data delay degree weights of described logic channel flexibly according to actual conditions in the medium access control layer, under the situation of importance greater than the data delay degree of priority of logical channels, the priority of logical channels weights are set greater than data delay degree weights, vice versa.
Further, the present invention also has following characteristics: medium access control layer carries out the selection of transformat combination to ready data block in the step (d) in the described step (e), if final selection result allows to send fully, then sends ready data block; If not, then according to the information in the protocol data unit priority message queue, according to priority orders from high to low, the protocol Data Unit of the statistics that added up in the transmit queue successively.
Further, the present invention also has following characteristics: medium access control layer distributes frame to select ready data block in the step (d) according to Flow Control in the described step (e), if final selection result allows to send fully, then sends ready data block; If not, then according to the information in the protocol data unit priority message queue, according to priority orders from high to low, the protocol Data Unit of the statistics that added up in the transmit queue successively.
Compared with prior art, the present invention has the following advantages:
The present invention combines the priority of logic channel, time of delay of data and according to the significance level of these two information in the logic channel, data in the logic channel are recomputated priority, and from high to low data are sent according to revised priority, this method can avoid the high priority logical channel data to cause that too much the low priority logical channel data stops up, cause the problem of flow process failure, can improve calling ratio of success, increase the stability and the reliability of system.
Description of drawings
Fig. 1 is the schematic diagram of WCDMA system air interface protocol layer;
Fig. 2 is the mapping relations figure of logic channel and transmission channel in the WCDMA system;
Fig. 3 is the functional block diagram of a specific embodiment of the present invention;
Fig. 4 is an idiographic flow block diagram of the present invention.
Embodiment
For understanding the present invention in depth, the present invention is described in detail below in conjunction with drawings and the specific embodiments.
The data delay time in the MAC layer mainly contains following several: to being mapped to the data of DCH, cause logical channel data can not fully to send for the restriction owing to TFC time of delay, and promptly be the times of data in logic channel time of delay; Be mapped to the data on FACH, the DSCH, owing to there is the Flow Control of MAC-d module and MAC-c/sh module, data in the MAC-d module can not send to the MAC-c/sh module fully, fail in time to send to physical layer after the MAC-c/sh module and in the medium time to be sent of MAC-c/sh module so be included in the time in the logic channel time of delay of these class data and send to; Be mapped to the data on the HS-DSCH, comprise existence equally, after being included in the time in the logic channel time of delay of data and sending to the MAC-hs module, in the medium time to be sent of MAC-hs module priority query owing to Flow Control.
In the MAC-d side, include only data the time of delay of data in the medium time to be sent of logic channel.
Fig. 3 has described four dedicated logical channel and has been mapped to a dedicated transmission channel or is multiplexed into FACH with same Common transport channel priority and function diagram of the present invention during MAC-d flow, present embodiment is placed on the data in four logic channels in the formation through after the processed, be in the protocol data unit priority message queue, carry out the TFC selection then or distribute the Flow Control data, send data to physical layer at last.
As shown in Figure 4, the priority processing method of 3-G (Generation Three mobile communication system) medium access control layer of the present invention comprises the steps:
Step 1, priority separately that RRC has been each logical channel assignment is made as P
Logi, (i=1,2,3,4), agreement regulation P
LogiScope is [1,8], wherein P
Logi=1 expression priority is the highest, P
Logi=8 expression priority are minimum; The MAC-d module is provided with the weights W of each priority of logical channels
Logi, (i=1,2,3,4), and the weights W of data delay degree
Ti, (i=1,2,3,4), and the MAC-d module also can be according to actual conditions to W
LogiAnd W
TiAdjust flexibly, under the situation of importance greater than the data delay degree of priority of logical channels, the priority of logical channels weights can be set greater than data delay degree weights, vice versa;
Step 2, when dispatching at every turn, each logical channel data of MAC-d module scanning rlc layer, and write down the entry-into-force time T of each protocol Data Unit (Protocol Data Unit abbreviates PDU as) in affiliated logic channel
I, k, (k=1,2 ..., j), promptly in logic channel i, have j PDU;
Step 3, MAC-d module are calculated the priority of each PDU according to following formula:
P
pdu(i，k)＝W
logi(8-P
logi)+W
TiT
i，k
Wherein, P
Pdu (i, k)The priority of k PDU among the presentation logic channel i;
Step 4, the MAC-d module sorts according to its priority from high to low to all PDU, and the precedence information of preserving each PDU is to initialized protocol data unit priority message queue in advance, and the precedence information of described each PDU comprises PDU priority, PDU Size (length) and affiliated logical channel number;
Step 5, the PDU that the MAC-d module is the highest according to priority, search the PDU identical statistics that adds up, obtain the number of data blocks that the upper strata need send, and add that with PDU Size MAC header (the multiplexing header length of C/T) such as obtains at data block length to be sent with its PDU Size;
Step 6, MAC carries out the TFC selection or distributes frame to select according to Flow Control ready data block in the step 5, if result that final TFC selects or Flow Control distribute frame not allow to send fully the PDU that is added up, then MAC is according to the information in the protocol data unit priority message queue, according to priority orders from high to low, the PDU of the statistics that added up in the transmit queue successively.
Through above processing, under the too frequent situation of high priority logical channel data, the data of the logic channel of low priority also can be after delay after a while, be sent to physical layer, solve the blockage problem of data thus as much as possible, avoid flow process failure or RLC on the low priority logic channel, irrecoverable error to occur.Yet, thus a bit postponing of the high-priority data of Yin Ruing, concerning whole link, also can tolerate.
The invention discloses in the 3-G (Generation Three mobile communication system) MAC-d module in the medium access control layer and many logic channels are carried out a kind of method of processed, the priority of this method integrated logic channel, time of delay of data and according to the significance level of these two information in the logic channel, data in the logic channel are recomputated priority, from high to low data are sent by revised priority, this method can avoid the high priority logical channel data to cause that too much the low priority logical channel data stops up, the problem that causes the flow process failure, can improve calling ratio of success, increase the stability and the reliability of system.
Above embodiment only is used to illustrate the present invention, but not is used to limit the present invention.
Claims (8)
1, a kind of priority processing method of 3-G (Generation Three mobile communication system) medium access control layer comprises the steps:
(a) radio resource control layer is each logical channel assignment priority according to the urgency level of transmission data; The MAC-d module is the priority and the data delay degree distribution weights of logic channel in the medium access control layer;
When (b) dispatching, MAC-d module statistics obtains the delay time of each protocol Data Unit in each logic channel at every turn;
(c) the MAC-d module is according to the priority of logic channel, and the priority weights of data delay time and logic channel and data delay degree weights in the logic channel calculate the priority of each protocol Data Unit;
(d) the MAC-d module sorts to each protocol Data Unit according to the protocol data unit priority that calculates, select the highest protocol Data Unit of priority as reference standard, data block to be sent such as obtain after the data that needs are sent are handled;
(e) ready data block in the medium access control layer control forwarding step (d).
2, the priority processing method of 3-G (Generation Three mobile communication system) medium access control layer according to claim 1 is characterized in that, described step (d) can be further divided into following steps:
(d1) the MAC-d module initialization is provided with the protocol data unit priority message queue;
(d2) the MAC-d module sorts to each protocol Data Unit from high to low according to the protocol data unit priority that calculates, and the precedence information of preserving each protocol Data Unit is to the protocol data unit priority message queue;
(d3) the MAC-d module is selected the protocol Data Unit identical with the highest protocol Data Unit length of the priority statistics that adds up, and the header that adds medium access control layer such as obtains at data block to be sent.
3, the priority processing method of 3-G (Generation Three mobile communication system) medium access control layer according to claim 2 is characterized in that: the precedence information of preserving in the described step (d2) comprises priority, length and the affiliated logical channel number of protocol Data Unit.
4, the priority processing method of 3-G (Generation Three mobile communication system) medium access control layer according to claim 1 is characterized in that: the formula that calculates protocol data unit priority in the described step (c) is
P
pdu(i，k)＝W
logi(8-P
logi)+W
TiT
i，k
Wherein, i presentation logic channel number, k are illustrated in the protocol Data Unit number in the logic channel, P
Pdu (i, k)The priority of k protocol Data Unit among the presentation logic channel i, P
LogiThe priority of presentation logic channel i, W
LogiThe priority weights of presentation logic channel i, T
I, kThe time of delay of k protocol Data Unit among the presentation logic channel i, W
TiThe data delay degree weights of presentation logic channel i.
5, the priority processing method of 3-G (Generation Three mobile communication system) medium access control layer according to claim 4, it is characterized in that: the priority limit of described logic channel is [1,8], its medium priority is to represent that priority was the highest at 1 o'clock, is to represent that priority was minimum at 8 o'clock.
6, the priority processing method of 3-G (Generation Three mobile communication system) medium access control layer according to claim 5, it is characterized in that: the MAC-d module can be adjusted the priority weights and the data delay degree weights of described logic channel flexibly according to actual conditions in the medium access control layer, under the situation of importance greater than the data delay degree of priority of logical channels, the priority of logical channels weights are set greater than data delay degree weights, vice versa.
7, the priority processing method of 3-G (Generation Three mobile communication system) medium access control layer according to claim 1, it is characterized in that: medium access control layer carries out the selection of transformat combination to ready data block in the step (d) in the described step (e), if final selection result allows to send fully, then send ready data block; If not, then according to the information in the protocol data unit priority message queue, according to priority orders from high to low, the protocol Data Unit of the statistics that added up in the transmit queue successively.
8, the priority processing method of 3-G (Generation Three mobile communication system) medium access control layer according to claim 1, it is characterized in that: medium access control layer distributes frame to select ready data block in the step (d) according to Flow Control in the described step (e), if final selection result allows to send fully, then send ready data block; If not, then according to the information in the protocol data unit priority message queue, according to priority orders from high to low, the protocol Data Unit of the statistics that added up in the transmit queue successively.
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| WO2014012405A1 (en) * | 2012-07-16 | 2014-01-23 | 中兴通讯股份有限公司 | Method and apparatus for processing vcg differential delay |
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| WO2016187885A1 (en) * | 2015-05-28 | 2016-12-01 | Qualcomm Incorporated | Detection and reduction of delays in reverse link control data |
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