CN101282169B - Method for generating and transmitting medium access control message - Google Patents
Method for generating and transmitting medium access control message Download PDFInfo
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- CN101282169B CN101282169B CN2007100962355A CN200710096235A CN101282169B CN 101282169 B CN101282169 B CN 101282169B CN 2007100962355 A CN2007100962355 A CN 2007100962355A CN 200710096235 A CN200710096235 A CN 200710096235A CN 101282169 B CN101282169 B CN 101282169B
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Abstract
For settle the technical problems, the invention provides a method for generating attribute information of a medium access control layer MAC. The method comprises the following steps: obtaining the basic attribute of the physical channel, writing into the basic attribute Profile field; and when the basic attribute of the physical channel is not a default value, obtaining the actual value of the attribute, and writing into the actual valve field of the attribute; wherein the specific value of the field is predefined by the system. The invention also provides a method for processing the attribute information, wherein the method comprises the following steps: (a) when the base station receives the attribute configuration information of physical layer of itself, generating the attribute information of MAC, and transmitting the attribute information of MAC to the receiving end; and (b) when the receiving end receives the attribute information, detecting the basic attribute domain of the information, and if the attribute domain is supported, furthermore obtaining the content of the attribute domain and recording.
Description
Technical field
The present invention relates to a kind of method that improves wireless communication system airlink efficiency of transmission, particularly relate to a kind of medium access control message generation method and processing method thereof.
Background technology
The current various wireless communication system of having, CDMA2000 (code division multiple access) for example, WCDMA (Wideband Code Division Multiple Access (WCDMA)), WiMAX (micro-wave access global inter communication), Wi-Fi (Wireless Fidelity) etc.The common problem that these wireless communication systems face is how to improve air interface transmission efficient.So in physical layer, layer 2, the MAC of LTE (Long Term Evolution) (media access control) for example, the MAC of UMB (Ultra-Mobile Broadband), the MAC of WiMAX system, the MAC layer of Wi-Fi all how considering in limited spectral bandwidth, obtains higher efficiency of transmission under limited Radio Resource.
This paper mainly considers is that message format for layer 2 designs.
Take IEEE802.16e-2005 as example, in this agreement, support that DCD (downlink channel description) message structure of OFDMA (OFDM) is following (table is slightly) at present:
This message cycle ground is being broadcast to all local terminal/radio repeater stations.By calculating as can be known, this message-length is minimum is 78 bytes.Some information field of the inside can also comprise a plurality of, so also more than 78 bytes in the situation of practical application.Definition according to 16e, this message is broadcast transmission, at least will send once in every 10 seconds, these 78 bytes need to take 13 time slots at least, need to take 2 symbols according to each time slot, 1 sub-channels (24 data subcarriers), the up-downgoing ratio is that 1:1 calculates, these 78 bytes need to be transmitted on the 0.453M of whole 10M bandwidth bandwidth, that is to say that this message (in 5ms) when sending has taken 4.53% Radio Resource at least.
This is only one of them MAC broadcast.According to the agreement of 16e, UCD (uplink channel description), DLMAP (downlink map), the message such as ULMAP (uplink map) are all broadcast transmissions.Can find out that such broadcast has consumed very large idle wireless resource.The broadcast that similar transmission down channel physical layer attributes is also arranged in other wireless system, and this class message generally needs the cycle to send, and taken equally very large idle wireless resource.
In addition because for the taking in a large number of Radio Resource, it is basically impossible to make for the expansion of base station ability, because the expansion of ability needs more byte come transmission capacity information.
Summary of the invention
The technical problem to be solved in the present invention is to provide a kind of building method of brand-new MAC layer message, and the method for base station and terminal constructions and this class message structure of parsing, can more rationally and carry out efficiently the transmission of MAC layer message, greatly reduce wireless resource utility efficiency.
In order to solve the problems of the technologies described above, the invention provides a kind of media access control layer MAC attribute message generation method, comprise following steps:
Obtain the base attribute of physical channel, write base attribute Profile field;
And when the base attribute of physical channel is not default value, obtain the actual value of this attribute, write attribute actual value field;
Above-mentioned field occurrence is by system's predefined.
Described method further comprises:
Obtain the optional attribute of physical channel, write optional attribute Option field.
When described optional attribute is not default value, obtain the actual value of this attribute, write attribute actual value field.
Comprise a length L ength field in described MAC attribute message, represent the length of this physical channel all properties content.
When a plurality of physical attribute is supported in the base station, comprise many cover attribute fields in the MAC attribute, every cover attribute field comprises corresponding base attribute Profile field and attribute actual value field, corresponding physical attribute.
A kind of media access control layer MAC attribute message transmission method comprises following steps: after (a) the physical layer attributes configuration messages of oneself is received in the base station, generate the MAC attribute message, this MAC attribute message is sent to receiving terminal;
(b) after receiving terminal is received this attribute message, detect the base attribute territory of this message, if support, continue to obtain content and the record of this Attribute domain.
In described step (b), if receiving terminal is not supported this base attribute, jump into next base attribute territory and process until detected all base attributes territories.
In described step (b), receiving terminal jumps to next base attribute according to the length field in this base attribute territory in the MAC attribute message.
In described step (a), the base station sends to receiving terminal at assigned timeslot with this MAC attribute message.
When the physical layer attributes of described base station changed, the network side informing base station sent to the base station with new physical layer attributes content.
Adopt method of the present invention, the byte number of message greatly reduces, and when aerial needs transmit of this sort message, greatly reduces air resource and takies, and has strengthened the flexibility of base station, has simplified the processing of terminal and base station, improves the performance of whole system.
Description of drawings
Fig. 1 is MAC attribute message structural representation of the present invention.
Embodiment
If can reduce the byte that broadcast takies, just can greatly save taking of Radio Resource.In addition, if reduce the byte that this class message takies, just can under same resource occupation condition, provide more ability to select, for the user provides more Extraordinary service.
The invention provides a kind of building method of brand-new MAC layer message, at first, the attribute in message is divided into following a few class:
(1) physical channel base attribute, the namely attribute that must support of this type of physical channel.
(2) physical channel optional attribute, the namely attribute that strengthens on the basis of base attribute of this type of physical channel.
Secondly,
(1) value of an acquiescence is arranged (comprising that fundamental sum is optional) for the attribute of each physical channel.
(2) when the actual property value of physical channel is not default value, need clearly to define.
Many cover physical attributes can be supported in (3) base stations, if receiving terminal is not supported certain cover physical attribute, can select to ignore.
Based on above principle, the present invention constructs the MAC attribute message as shown in Figure 1:
Each parameter declaration is as follows:
Profile
The base attribute that represents this physical channel, each Profile value have represented attribute and the default value that a cover must be supported.In order to support autgmentability, when first byte of Profile is 0xFF, represent that next byte is the expanding value of Profile, otherwise Profile only has a byte, next byte is the Length territory.The value of Profile needs predefined.For example WiMAX Forum according to the demand of operator, has defined the essential content that System Profile1.0.0 and wave2 require.Here it is one the cover Profile, can be defined as 0x01.Corresponding wave3 can be defined as 0x02, the like, new Profile can continue to be defined as new Profile value.
Length
Represent the content-length that this Profile comprises.Take byte as unit.
Option
Represent that this physical channel increases the attribute of supporting on the basis of base attribute.One side is the ability of extended base station neatly, has also improved the performance of base station simultaneously.Same, in order to support autgmentability, when first byte of Option is 0xFF, represent that next byte is the extended field of Option, otherwise the Option territory just only has a byte long, next byte is the BSFeature territory.The value of Option needs predefined.
Take IEEE802.16 as example, on the basis of Profile (0x01), can increase according to the definition of IEEE802.16e the support to FBSS (fast base station switching), that is to say increase: H_AddThreshold, H_Delete Threshold, three information fields of ASR, we Option=0x01 that is combined as that can define this cover parameter represents that this base station supports FBSS so.If same support HARQ (mixed automatic retransfer) can be defined as Option=0x02 with relevant parameter combinations, represent this base station support HARQ.If two optional attributes are all supported, be defined as 0x03.If there is no the Option option, the Option territory is set to 0x00.
B SFeatureClass and Value
These two territories occur simultaneously, and effective range is in above-mentioned Prifile and Option territory.Expression is based in above Profile territory and Option territory, with the different information field combination of default value and actual value.By pre-defined composite type, and provide actual value, base station property can be set neatly.
For example, definition according to IEEE802.16e, BSID information unit in DCD message belongs in the Profile territory, its default value is 0x000000000001, configuration according to this base station, actual value should be 0x003200000000, so just needs BSFeatureClass and Value to help provide actual value.For example BSFeatureClass=0x0D, represent that next byte begins, and back to back 6 bytes represent actual BSID value, for example 0x003200000000.For example the default value of PagingGroupID is 0x0001 again, and according to configuration, the PagingGroupID=0x0102 that this base station is corresponding so also needs to help provide actual value by BSFeatureClass and Value.For example BSFeatureClass=0x02, represent that next byte begins, and back to back 2 bytes represent actual PagingGroupID value, for example 0x0102.
The like, there are attribute and default value in any Profile of belonging to and the set of Option information unit different in message, need to increase cover BSFeatureClass and a Value.
Relation between these five territories is as follows:
Profile{
Length (byte number that following all contents take)
Option
{
{BSFeatureClass1
Value}
{BSFeatureClass2
Value}
}
}
That is to say, every cover Profile comprises zero or one cover Option attribute, in the scope in Profile and Option territory, can provide the actual use value different from default value by a cover or many covers (BSFeatureClass, Value).
If multiple Profile can be supported in a base station, can comprise many these message structures of cover in MAC message, every kind of Profile represents with Profile+Option+BSFeatureClass+Value.
Take the DCD message of above-mentioned IEEE802.16 as example, if the wave2 based on WiMAX ForumPICS V1.0.0 is supported in the base station, also support simultaneously FBSS, in message content, BSID, PagingGroupID is different from default value, is respectively BSID=0x003200000000 and PagingGroupID=0x0102, the base station is according to above principle, and the DCD for preparing aloft to transmit thes contents are as follows:
0x01，0x01，0x0d，0x003200000000，0x02，0x0102
So only utilize 13 bytes, just can channel attribute be described.The Radio Resource that takies is only 16.8% of present MAC attribute message.
Under extreme case, suppose that the actual content of information units all in Profile and Option and default value are all different, so still take top example as example, need to take 61 bytes, the Radio Resource that takies is 79% of present MAC attribute message.
It is more than the building method of MAC attribute message.
The invention allows for a kind of method of transmitting this MAC message.
The structure of physical layer attributes message according to above-mentioned MAC message structure, is carried out in the base station after receiving the physical layer attributes configuration information of oneself, building method as mentioned above;
After construction complete, this message is sent to receiving terminal at assigned timeslot;
After receiving terminal is received, at first detect the Profile territory, if support this territory, continue to obtain the content of ensuing information field, Length for example, Option and { BSFeatureClass, Value}, and record;
If next Profile is leapt to according to the content in Lengh territory in receiving terminal None-identified Profile territory, begin identification and the acquisition of information of new Profile.
When the physical layer attributes of base station changed, network side should informing base station, and altered information unit content is issued the base station.
After receive the base station, upgrade the physical layer attributes of oneself, according to the complete physical layer attributes message of new composition of content, building method as mentioned above.
After construction complete, this message is sent to receiving terminal at the time slot of appointment.
Receiving terminal receives, identification, and upgrade the physical layer attributes record.
Adopt method of the present invention, when aerial needs transmit of this sort message, greatly reduce air resource and take, strengthened the flexibility of base station, simplified the processing of terminal and base station, improve the performance of whole system.
Claims (8)
1. media access control layer MAC attribute message generation method comprises following steps:
Obtain the base attribute of physical channel, write base attribute Profile field;
And when the base attribute of physical channel is not default value, obtain the actual value of this base attribute, write attribute actual value field; Above-mentioned field occurrence is by system's predefined;
Wherein, obtain the optional attribute of physical channel, write optional attribute Option field.
2. the method for claim 1, is characterized in that: when described optional attribute is not default value, obtain the actual value of this optional attribute, write attribute actual value field.
3. the method for claim 1, is characterized in that: comprise a length L ength field in described MAC attribute message, represent the length of this physical channel all properties content.
4. the method for claim 1, it is characterized in that: when a plurality of physical attribute is supported in the base station, comprise many cover attribute fields in the MAC attribute, every cover attribute field comprises corresponding base attribute Profile field and attribute actual value field, corresponding physical attribute.
5. media access control layer MAC attribute message transmission method comprises following steps:
(a) after the physical layer attributes configuration messages of oneself is received in the base station, generate the MAC attribute message according to the method for claim 1, this MAC attribute message is sent to receiving terminal;
(b) after receiving terminal is received this attribute message, detect the base attribute territory of this message, if support, continue to obtain content and the record of this Attribute domain.
6. method as claimed in claim 5 is characterized in that: in described (b), if receiving terminal is not supported this base attribute, jump into next base attribute territory and process until detected all base attributes territories.
7. method as claimed in claim 6 is characterized in that: in described (b), receiving terminal jumps to next base attribute territory according to the length field in this base attribute territory in the MAC attribute message.
8. method as claimed in claim 5, it is characterized in that: in described (a), the base station sends to receiving terminal at assigned timeslot with this MAC attribute message.
9. method as claimed in claim 5 is characterized in that: when the physical layer attributes of described base station changed, the network side informing base station sent to the base station with new physical layer attributes content.
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| CN2007100962355A CN101282169B (en) | 2007-04-03 | 2007-04-03 | Method for generating and transmitting medium access control message |
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| CN2007100962355A CN101282169B (en) | 2007-04-03 | 2007-04-03 | Method for generating and transmitting medium access control message |
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