CN101459590B - Bandwidth recovery method applied to communication system - Google Patents

Bandwidth recovery method applied to communication system Download PDF

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CN101459590B
CN101459590B CN2007101971686A CN200710197168A CN101459590B CN 101459590 B CN101459590 B CN 101459590B CN 2007101971686 A CN2007101971686 A CN 2007101971686A CN 200710197168 A CN200710197168 A CN 200710197168A CN 101459590 B CN101459590 B CN 101459590B
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scheduling message
communication
time
communication node
scheduling
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CN101459590A (en
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周孜灿
林钰翔
吕礼仁
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Abstract

The invention provides a bandwidth restoring method applied in a communication system, which comprises transmitting a first uploading and scheduling message to at least a communication node and a second communication node in a plurality of communication nodes of a communication system, detecting whether a communication channel is in an idle state or not after first starting transmission time, and transmitting a second uploading and scheduling message to the communication nodes after finding that the communication channel is in an idle state after the first start transmission time.

Description

Be applied to the bandwidth restoration methods of communication system
Technical field
The present invention especially refers to a kind of method that bandwidth is recovered in the communication system that is used for handling relevant for communication system.
Background technology
The wireless access technology of IEEE 802.16 international standards, its main purpose is to solve the problem of " last mile ": the wire communication that will grow distance is (as utilizing cable (cable), digital user loop (Digital Subscriber Loop, DSL)) reaches generation with Wireless transmission mode.
The wireless access technology that is different from IEEE 802.11, IEEE 802.16 is at medium access control system (Media Access Control, MAC) can utilize on the scheduling algorithm (scheduling algorithm) come distributing radio resource give the telex network platform (Subscriber Station, SS).According to the standard of IEEE 802.16, the time can be cut into the time frame (frame) of many fixed sizes, and each frame passes subframe (DL subframe) and uploads subframe (UL subframe) under being divided into; And the length of two subframes can be inequality.Pass down subframe during in, communication flows mainly is to be that (BaseStation BS) transmits data and gives the telex network platform base station; Relatively, the communication flows of uploading subframe mainly is to be that the telex network platform transmits data and gives base station.Have a bit of message as uploading scheduling message (in IEEE 802.16 communication specifications, also being called UL-MAP) passing subframe part at a first brush down, the scheduling planning when its content just contains base station and transmits message for beneath telex network platform; That is can stipulate that when which telex network platform can transmit the data of how much length in the middle of uploading scheduling message, announce to the telex network platform under it by the mode of broadcasting (broadcasting) again.
Yet when following several situation takes place, upload channel and may produce the waste of leaving unused thereby causing bandwidth:
1. whole section during uploading is idle:
As the close base station of interference source, thereby cause uploading the interior message damage of scheduling message, make that all the telex network platforms under the base station all can't be received correct scheduling message; Therefore can't learn also when this uploads data.So just, cause during whole the uploading whole section quilt idle (interiorly during the subframe uploading data), and cause serious bandwidth waste without any the telex network platform because of uploading.
2. the fragment during uploading is idle:
As interference source when certain user's called station, to cause those telex network platforms can't correctly receive the message of uploading scheduling message, just in time contain the message of informing that when those telex network platforms should be uploaded in if upload scheduling message this moment, then original base station is planned the period of uploading data to those telex network platforms just by idle, thereby causes the waste of bandwidth.
3. fill waste (padding wasting):
If specification according to IEEE 802.16, the uplink time length that is assigned to when the telex network platform is real when transmitting the required time span of data greater than it, the telex network platform must transmit padding data (paddingdata) to supply remaining uplink time, sometimes the big I of these padding datas is up to 2041 bit groups, thereby forms serious waste.
Yet, in the middle of the standard of existing IEEE 802.16, above-mentioned these situations are not done any processing, therefore, need the problem that a kind of bandwidth Restoration Mechanism solves above-mentioned bandwidth waste badly.
Summary of the invention
Therefore one of purpose of the present invention be that the method that provides a kind of bandwidth to recover solves above-mentioned problem in a communication system.
One embodiment of the invention provide a kind of bandwidth restoration methods that is applied to a communication system, include: transmit one first and upload scheduling message at least one first communication node and second communication node to a plurality of communication nodes of this communication system, this first communication node and the shared communication channel of this second communication node, this first uploads scheduling message in order to set the period of communicating by letter that this first communication node and this second communication node are distributed in this communication channel; Detect this communication channel and after one first initial delivery time, whether be in an idle state, wherein time of being allowed to begin to transmit data for this first communication node this first initial delivery time; And when finding that this communication channel is in this idle state after this first initial delivery time, then transmit one second and upload scheduling message to these a plurality of communication nodes, wherein this second uploads scheduling message in order to set in this first communication node and this second communication node at least one in communicating by letter the period that this communication channel is distributed.
Description of drawings
Figure 1 shows that one embodiment of the invention when base station is disturbed provide the sequential chart of bandwidth restoration methods.
Figure 2 shows that the first embodiment of the present invention when telex network platform is disturbed provides the sequential chart of bandwidth restoration methods.
Figure 3 shows that the telex network platform be interfered so that can't correctly receive base station and sent newly upload scheduling message the time first embodiment of the present invention sequential chart of bandwidth restoration methods is provided.
Figure 4 shows that the second embodiment of the present invention when telex network platform is disturbed provides the sequential chart of bandwidth restoration methods.
The first embodiment of the present invention provides the sequential chart of bandwidth restoration methods when Figure 5 shows that generation filling waste situation.
The second embodiment of the present invention provides the sequential chart of bandwidth restoration methods when Figure 6 shows that generation filling waste situation.
The main element symbol description
102,402,502,602,106,206,306,310,406,506,606 upload scheduling message 104,404,408,108 uplink times planning content
BS base station SS1-SS4 telex network platform
Embodiment
Please refer to Fig. 1, Figure 1 shows that one embodiment of the invention when base station is disturbed provide the sequential chart of bandwidth restoration methods.As shown in Figure 1, base station BS can transmit one section and uploads scheduling message 102 (defined UL-MAP in IEEE 802.16 communication protocols for example passing the subframe stage at a first brush down, and in following paragraph, for the ease of clearly demonstrating technical characterictic of the present invention, just with " UL-MAP " an example explanation being used as uploading scheduling message, but please note, this is not to be used for limiting the disclosed scheduling mechanism of uploading of the present invention only can be applicable to IEEE 802.16 communication systems) to beneath telex network platform (that is communication node) SS1~SS4 (be four telex network platforms in this example, please note, the number of telex network platform for the usefulness of example explanation, is not restriction of the present invention only).Upload the scheduling planning when containing base station BS in the middle of the scheduling message (UL-MAP) 102 and uploading for beneath telex network platform SS1~SS4, its main contents are the identification code SSi of each telex network platform, the initial delivery time ti of each telex network platform and delivery time length (communication period) x that each telex network platform is assigned to i(i=1~4); Wherein, initial delivery time ti is the time that telex network platform i is allowed to can begin to transmit data, and t iWith x iRelation as follows:
x i+1=x i+t i
Uplink time planning content 104 is the situation that script base station BS distributes beneath telex network platform SS1~SS4 uplink time.When telex network platform SS1~SS4 can both correctly receive when uploading scheduling message (UL-MAP) 102, then uploading in the period of subframe, each telex network platform just can be planned the planning of content 104 according to uplink time, uploads according to the assigned separately communication period.
This moment is if having interference source when the base station BS, upload scheduling message (UL-MAP) 102 and just can't be received by telex network platform SS1~SS4 institute is correct, thereby all telex network platforms in the period of uploading subframe neither meeting upload.In the present embodiment, base station BS can detect in the period of uploading subframe and upload channel (note that upload channel shared by telex network platform SS1~SS4 institute) and whether be in idle state; When realizing that being assigned with the telex network platform (being SS1 in this example) that will upload (is t in this example in the initial delivery time 1) afterwards, the time of not transmitting data surpasses a scheduled time h 1The time, then base station BS can be in (t 1+ h 1) send afterwards and upload scheduling message (UL-MAP) 106 to beneath telex network platform; Wherein, scheduled time h 1Can not be less than signal passing time (propagation time) (because wireless carrier will pass through the time that this section transmits in air at least, the telex network platform just can be received).
The invention provides the practice that two kinds of bandwidth are recovered, abbreviate R1 and R2 respectively as, to solve aforesaid bandwidth waste problem.Base station BS in pass down the subframe period transmit upload scheduling message (UL-MAP) before, can calculate earlier and upload the communication period x that scheduling message distributes iWhether all surpass a threshold value; If all communication period x that distributed iAll surpass this threshold value, then base station BS can determine this employing restoration methods R1 or restoration methods R2 by free Hui; Otherwise base station BS only can adopt restoration methods R1.And this judgement formula and threshold value will describe in detail in the back.
In restoration methods R1, base station BS can redistribute planning with remaining uplink time.As shown in Figure 1, scheduling message (UL-MAP) the 106 central contained contents of uploading of present embodiment are the new initial delivery time t of each telex network platform i *And each telex network platform is assigned to new delivery time length x i *, and uplink time planning content 108 is new planning mode.And the new initial delivery time t of telex network platform SS2 2 *=(t 1+ h 1+ h 2); Period h 2Time (the t that scheduling message (UL-MAP) 106 sends out is uploaded in representative 1+ h 1) to the initial delivery time t of telex network platform SS2 2 *Between time difference, and
h 2≥T proc+T UM+STTG+u;
Wherein,
T Proc: medium insert processing controls (Media Access Control, MAC) required processing time;
T UM: transmit and to upload the required time of scheduling message (UL-MAP) 106;
STTG: telex network platform SS2 transfers the required operating time of delivery status to by accepting state; And
U: signal passing time.
Change speech, upload another initial delivery time that scheduling message 106 planned and be after the delivery time of uploading scheduling message 106 a specific period (that is above-mentioned h at interval 2), and this initial delivery time is the time that telex network platform SS2 is allowed to can begin to transmit data, and this specific period is not less than the delivery time of uploading scheduling message 106 and plays an operating time (that is the above-mentioned T that can begin to transmit data to telex network platform SS2 Proc+ T UM+ STTG+u).
Please refer to Fig. 2, Figure 2 shows that the first embodiment of the present invention when telex network platform is disturbed provides the sequential chart of bandwidth restoration methods.Similar with Fig. 1, if base station BS uploads the channel idle time when surpassing a scheduled time h1 in period of uploading subframe detect, and base station BS can redistribute the planning uplink time and in (t 1+ h 1) time sends and to upload scheduling message (UL-MAP) 206 to beneath telex network platform.All the other detail sections are all identical with Fig. 1, so do not giving unnecessary details at this.
Please refer to Fig. 3, Figure 3 shows that the telex network platform is interfered so that can't receive correctly that base station BS sent newly upload scheduling message the time first embodiment of the present invention sequential chart of bandwidth restoration methods is provided.As shown in the figure, its details is roughly identical with Fig. 1 and Fig. 2; Uniquely different be that telex network platform SS2 sends in base station BS and newly uploads scheduling message (UL-MAP) and be interfered in 306 o'clock, so that can't correctly receive The to uploading scheduling message (UL-MAP) 306.Owing to detect interference, the telex network platform SS2 of this moment can't upload.Be similar to Fig. 1 and Fig. 2 is described, base station BS in transmitted upload scheduling message (UL-MAP) 306 after, upload the channel idle time when still surpassing a scheduled time h1 if detect, base station BS can redistribute the remaining uplink time of planning again, and in (t 1+ h 1+ h 2+ h 1) time sends and new upload scheduling message (UL-MAP) 310 to beneath telex network platform.Telex network platform under this moment is just uploaded according to uploading scheduling message (UL-MAP) 310 contents of being planned.
From above embodiment as can be known, the characteristics of restoration methods R1 are that base station BS is resending when once uploading scheduling message (UL-MAP), can redistribute and plan the uplink time of telex network platform.In addition, before also having no chance to upload data, must be in the state of listening attentively to (listening state) in the telex network platform is being uploaded period of subframe, the STTG time before uploading data just begins to transfer to delivery status (transmitting state).If the telex network platform precedingly can't correctly be understood the message of uploading scheduling message (UL-MAP) what wait was uploaded, then be judged to be conflict situation (collision state), must temporarily stop to upload planning of data, up to correctly receive again upload scheduling message (UL-MAP) till, and according to this one new upload that scheduling message sets upload scheduling planning with data upload to base station.
And, must satisfy following condition if want to carry out restoration methods R2:
X i〉=h 1+ h 2+ D+T BR, all must set up all 1≤i≤4.
Wherein,
D: preamble synchronization time+STTG;
T BR: transmission bandwidth requires (bandwidth request) the required time.
That is to say that base station BS is in passing can whether all setting up the following condition of beneath all telex network platforms (if the number of telex network platform is N, then i=1-N) inspection earlier at the beginning of subframe: x down i-(h 1+ h 2) 〉=D+T BRThat is whether check earlier the assigned communication period x of all telex network platforms i, deducting transmission and handling and upload the required time h of scheduling message 1+ h 2Whether afterwards, remaining transmitted data time is still greater than transmitting the required time (D+T in a minimum data unit BR); Wherein, preamble synchronization position (Preamble) adds that it is a minimum transmissible data cell that STTG adds bandwidth requirement (Bandwidth Request).Because restoration methods R2 can be to communication period x iAgain planning (except confiscating the telex network platform of uploading scheduling message) in passing the subframe period down, so this conditional is for carrying out the necessary condition of restoration methods R2.
Please refer to Fig. 4, Figure 4 shows that the second embodiment of the present invention when telex network platform is disturbed provides the sequential chart of bandwidth restoration methods.As shown in Figure 4, base station BS can determine to adopt restoration methods R2 (if x passing the subframe stage at a first brush down i〉=h 1+ h 2+ D+T BR, all 1≤i≤4 are all set up), and transmit and to upload scheduling message (UL-MAP) 402, and telex network platform SS1~SS4 just can plan that content 404 uploads according to uplink time to beneath telex network platform SS1~SS4.As shown in the figure, because telex network platform SS1 can't correctly receive and upload scheduling message (UL-MAP) 402, therefore when the initial delivery time, t1 began, do not have any data upload to base station BS.When detecting in the period of uploading subframe, base station BS uploads the channel idle time above a scheduled time h 1The time, base station BS can check earlier that whether last uplink time is greater than h 2+ D+T BRIf then send and upload scheduling message (UL-MAP) 406 to beneath telex network platform SS1~SS4.Among this embodiment, uploading the uplink time planning content 408 of scheduling message (UL-MAP) 406 compares with the uplink time planning content 404 of uploading scheduling message (UL-MAP) 402, except telex network platform SS1, the initial delivery time ti of all the other telex network platform SS2~SS4 and the delivery time length xi (i=2~4) that is assigned to all remain unchanged.As for the originally assigned communication period x1 of telex network platform SS1, just only be left x this moment 1-(h 1+ h 2) time can be used to transmit data.
Please note, in this embodiment, upload scheduling message (UL-MAP) 402 and also can utilize available period of residue of the communication period that telex network platform SS1 distributes originally, set an additional communication period and give follow-up other telex network platform, for example distribute and give telex network platform SS4, therefore, telex network platform SS4 just has two communication periods can upload operation, and this design variation also belongs to category of the present invention.
Restoration methods R2 and R1 different be in: if use the restoration methods of R2, then base station BS can't redistribute and plan the uplink time of telex network platform, in addition, the telex network platform is as long as receive once the correct scheduling message (UL-MAP) of uploading before uploading data.As shown in Figure 4, do not upload scheduling message (UL-MAP) 406 although telex network platform SS2 has that the As-received platform sent, but upload scheduling message (UL-MAP) 402 because telex network platform SS2 has correctly received in the beginning that passes subframe down, so telex network platform SS2 still can be according to the initial delivery time t of regulation 2Begin to transmit data.
Please refer to Fig. 5, the first embodiment of the present invention provides the sequential chart of bandwidth restoration methods when Figure 5 shows that generation filling waste situation.In this embodiment, as the assigned delivery time length x of telex network platform SS2 2Transmit the required real time of data during length greater than telex network platform SS2, then after telex network platform SS2 transmission data finish, do not transmit any filling (padding) data; Thereby additional afterwards uplink time just leaves unused.As shown in Figure 5, base station BS as preceding described, detect earlier, send then and upload scheduling message (UL-MAP) 506.Base station BS can adopt the mode of restoration methods R1, and the uplink time that telex network platform SS2 does not use up is distributed to telex network platform SS3 and SS4.If the available uplink time of residue is (T 3+ T 4), so in uploading scheduling message (UL-MAP) 506, the delivery time length x that telex network platform SS3 is new 3 *Can be (x 3+ T 3), and the new delivery time length x of telex network platform SS4 4 *Then be (x 4+ T 4).Please note at this, embodiment shown in Figure 5 all gives telex network platform SS3 and SS4 with the uplink time that telex network platform SS2 does not use up, yet, this is only as the example explanation, in other execution modes, the uplink time that telex network platform SS2 does not use up can suitably be distributed to follow-up telex network platform and not limit and will divide equally according to demand, and this design variation also belongs to category of the present invention.
Please refer to Fig. 6, the second embodiment of the present invention provides the sequential chart of bandwidth restoration methods when Figure 6 shows that generation filling waste situation.When the assigned delivery time length x2 of telex network platform SS2 transmits the required real time of data during length greater than telex network platform SS2, then after telex network platform SS2 transmission data finish, do not transmit any filling (padding) data; Thereby additional afterwards uplink time just leaves unused.As shown in Figure 6, base station BS as preceding described, detect earlier, and check that whether last uplink time is greater than h 2+ D+T BRIf then right Hou sends uploads scheduling message (UL-MAP) 606.Base station BS can adopt the mode of restoration methods R2, that is still adopts the uplink time planning content 604 of uploading scheduling message (UL-MAP) 602, and just the uplink time that telex network platform SS2 is not used up is distributed to telex network platform SS3.If the available uplink time of residue is T3, so in uploading scheduling message (UL-MAP) 606, the delivery time length x that telex network platform SS3 is new 3 *Can be (x 3+ T 3), and the new delivery time length x of telex network platform SS4 4 *Then be x 4
Note that allocated bandwidth mode as an illustration the usefulness only in the middle of the foregoing description, not can be used as restrictive condition of the present invention.In addition, although the above embodiments are all to meet the communication system of IEEE 802.16 specifications, bandwidth restoration methods provided by the present invention also can be used for the communication system of any use time division multiplexing mechanism, all belongs to category of the present invention.
Benefit of the present invention is: by resending the mechanism of uploading scheduling message (for example defined UL-MAP in the IEEE 802.16 communication specifications), idle originally channel can be done more efficient utilization, to reduce the situation of bandwidth waste in the known technology.
The above only is preferred embodiment of the present invention, and all equivalences of carrying out according to claim of the present invention change and revise, and all should belong to covering scope of the present invention.

Claims (10)

1. bandwidth restoration methods that is applied to use the communication system of time division multiplexing mechanism includes:
Transmit one first and upload scheduling message at least one first communication node and second communication node to a plurality of communication nodes of this communication system, this first communication node and the shared communication channel of this second communication node, this first uploads scheduling message in order to set the period of communicating by letter that this first communication node and this second communication node are distributed in this communication channel;
Detect this communication channel and after one first initial delivery time, whether be in an idle state, wherein time of being allowed to begin to transmit data for this first communication node this first initial delivery time; And
When finding that this communication channel is in this idle state after this first initial delivery time, then transmit one second and upload scheduling message to these a plurality of communication nodes, wherein this second uploads scheduling message in order to set in this first communication node and this second communication node at least one in communicating by letter the period that this communication channel is distributed.
2. the method for claim 1, wherein detect whether this communication channel be in this idle state after this first initial delivery time step and include:
Whether detect this first communication node do not transmit data after this first initial delivery time time surpasses a scheduled time, and this scheduled time is not less than a signal passing time.
3. the method for claim 1, other includes:
A communication node transmits the required real time length of data in the specific communications period that this communication channel is distributed greater than this communication node in these a plurality of communication nodes, then after the interior transmission data in this communication node in this specific communications period finish, do not transmit any filling (padding) data.
4. the method for claim 1, wherein this second scheduling of uploading scheduling message is set and to be different from this first scheduling of uploading scheduling message and to set, and this second is uploaded scheduling message and plan at least this second communication node institute's communication period of distribution originally in this first scheduling of uploading scheduling message is set again.
5. method as claimed in claim 4, wherein this second is uploaded one second initial delivery time that scheduling message plans and second uploads after delivery time of scheduling message a specific period at interval for this, the time that this second initial delivery time is allowed to can begin to transmit data for this second communication node, and this specific period be not less than this delivery time and play the operating time that can begin to transmit data to this second communication node.
6. the method for claim 1, wherein this second scheduling of uploading scheduling message is set and to be different from this first scheduling of uploading scheduling message and to set, and this second is uploaded scheduling message and keep at least this second communication node institute's communication period of use originally in this first scheduling of uploading scheduling message is set.
7. method as claimed in claim 6 wherein transmits this and second uploads and need judge earlier whether last uplink time surpasses a threshold value before the scheduling message.
8. method as claimed in claim 7, wherein this threshold value is not less than and can transmits one and upload the operating time that scheduling message adds that a minimum data unit is required.
9. method as claimed in claim 6, wherein this second is uploaded scheduling message and plans in addition this first communication node communication period that institute distributes originally in this first scheduling of uploading scheduling message is set again, with in this first scheduling of uploading scheduling message is set the residue of communication period of script distribution set an additional communication period in the available period and give this second communication node.
10. method as claimed in claim 9, wherein this second is uploaded one the 3rd initial delivery time that scheduling message plans and second uploads after delivery time of scheduling message a specific period at interval for this, the time that the 3rd initial delivery time was allowed to can begin to transmit data for this second communication node, and this specific period be not less than this delivery time and play the operating time that can begin to transmit data to this second communication node.
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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1146111A (en) * 1995-06-07 1997-03-26 日本电信电话株式会社 Method and system for data communication
CN1218341A (en) * 1997-11-14 1999-06-02 日本电气株式会社 Communication control method and communication control apparatus
CN1360452A (en) * 2000-12-19 2002-07-24 华为技术有限公司 Channel distribution method for multiple services at base station in GPS system

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1146111A (en) * 1995-06-07 1997-03-26 日本电信电话株式会社 Method and system for data communication
CN1218341A (en) * 1997-11-14 1999-06-02 日本电气株式会社 Communication control method and communication control apparatus
CN1360452A (en) * 2000-12-19 2002-07-24 华为技术有限公司 Channel distribution method for multiple services at base station in GPS system

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