CN1427634A

CN1427634A - Comprehensive switch on business realizing method based on aerial band width resources

Info

Publication number: CN1427634A
Application number: CN 01139190
Authority: CN
Inventors: 张志华; 李刚; 范炯毅; 林舒
Original assignee: Shanghai No 2 Research Institute of ZTE Corp
Current assignee: ZTE Corp
Priority date: 2001-12-21
Filing date: 2001-12-21
Publication date: 2003-07-02
Anticipated expiration: 2021-12-21
Also published as: CN1253021C

Abstract

A method for implementing the integrated access service based on space bandwidth resource features that the up and down transmission of E1 data can be performed between termnial and base station. The steps for up transmission of E1 data include generating bandwidth allocation map chart to determine the transmission time, writing the time to register of terminal, transmitting E1 data according to the time, and receiving E1 data by base station according to its special ID. The steps for down transmission of E1 data include setting up register with E1 service parameters, setting up E1 data area in MPEG frame, loading E1 data to the area, and transmitting.

Description

A kind of comprehensive switch on business implementation method based on the air bandwidth resource

Technical field

The present invention relates to BWA in the communication field, particularly relate to a kind of comprehensive switch on business implementation method in the BWA based on the air bandwidth resource.

Background technology

BWA adopts the point-to-multipoint wireless transmission method to realize that the fixed wireless integrated service between user network and the backbone network inserts, and its service object mainly is a group user, is used for users' such as enterprise, residential quarter comprehensive access.

So far, do not have a kind of over-the-air protocol that is suitable for BWA, particularly can support the real-time circuit service that broadband wireless access provides.And DOCSIS agreement (Data-Over-Cable Service Interface Specifications) is the standard of formulating for the cable TV network bidirectional data transmission system, wherein mainly stipulate the implementation of physical layer and MAC layer, the point-to-multipoint integrated service that is used for cable TV network inserts.

Summary of the invention

The technical problem to be solved in the present invention is, transmission medium at BWA is different with cable network, and support the characteristics of real-time Circuit Service, the allocated bandwidth strategy of DOCSIS agreement is expanded and revises, overcome the DOCSIS agreement and do not support the shortcoming of broadband wireless access, provide the needs of real-time Circuit Service to satisfy BWA.

Technical program of the present invention lies in, a kind of comprehensive switch on business implementation method based on the air bandwidth resource is provided, comprise the up transmission and the descending transmission of E1 data, it is characterized in that,

Described E1 data uplink sends and may further comprise the steps: 1) generate the allocated bandwidth with fixed cycle and shine upon (MAP) figure to determine the transmitting time of up E1 data; 2) terminal is according to the MAP of described generation figure, and the transmitting time of E1 data is write hardware register; 3), send the E1 data according to the transmitting time in the described hardware register; 4) base station receives described E1 data according to special identification code,

Described E1 data downstream sends and may further comprise the steps: 1) the E1 service parameter is set in hardware register; 2) hardware is provided with in mpeg frame according to described parameter and is specifically designed to the zone that sends the E1 data; 3) the E1 data being put into above-mentioned zone sends.

In above-mentioned steps, relate to the DOCSIS mac frame, below it is simply introduced.The DOCSIS agreement is the MAC layer in the corresponding ISO OSI of regulation network seven layer protocols and the agreement of PHY layer, the topmost content of its MAC layer definition is to be guaranteed by the allocated bandwidth of base stations control and corresponding QoS, relate to simultaneously variable-length, multiple speed, and to the support of polytype bag in the future.

The elementary cell that sends between the MAC layer of base station and terminal is a mac frame.The uplink and downlink direction is used identical basic frame structure.The length of mac frame is variable, is divided into four kinds: the mac frame of bag PDU, the bag data PDU of the ethernet type of support variable-length; The mac frame of ATM cell has ATM PDU in the expression frame; The mac frame that keeps in the future PDU type; The mac frame that is used for specific MAC control.

Wherein specific mac frame is used for specific function, and these functions can support that descending timing and uplink distance measuring/power modulation, terminal are the cascade of terminal distribution bandwidth etc., segmentation and a plurality of mac frames to base station requests bandwidth, base station.

Step 1 in the above-mentioned up transmission relates to MAP, simply introduce the upstream bandwidth allocation map (MAP) of DOCSIS below, the data flow that up channel is made up of mini-slot, the base station must can generate the timing reference that is used to discern these time slots, in addition, it also must insert these time slots by control terminal.For example, it can be used to send data PDU for some continuous slot of authorization terminal.Terminal must receive in the official hour reference to guarantee the base station according to regularly requiring to send data.

System realizes the upstream channel bandwidth management by allocation map (MAP).MAP is by the MAC administrative messag of base station in the variable-length of down channel transmission, the transmission opportunity of definition up channel.It comprises fixed length letter head and many information element IE (INTERVAL ELEMENT), and each information element has defined the scope that allows the mini-slot of use.Given MAP can specify some time slot to send the mandate of data as specific station, and some time slot is used for contention requests, and some time slot is that new website adds incoming link and offers an opportunity.

Step 1 in the above-mentioned up transmission relates to the Bandwidth Management of the professional up channel of E1, for the E1 business, is specific real time business, and adopting to provide initiatively provides band width service (Unsolicited GrantService UGS).The base station is necessary for this Business Stream fixing data transfer bandwidth periodically is provided, and sets up Business Stream according to the professional way of E1 that this terminal is opened for the E1 data flow of each terminal, specifies relevant parameter.Then this Business Stream is activated, distribute SID.

For the E1 business, in primary MAP frame, data grant is carried out in each terminal E1 Frame transmission opportunity.Later on each base station no longer licenses to the E1 business in the MAP frame, do not make other purposes (can will distribute to a SID who does not have terminal to use during this period of time) during this period of time but also do not specify.Terminal is preserved transmission opportunity and transmission cycle, still sends the E1 Frame according to certain cycle opportunity in transmission.But when transmission need change opportunity, (increase or reduce the circuit number of N * 64K as certain terminal), send the MAP frame again, the transmission of E1 business is authorized opportunity.Simultaneously can once send mandate to the E1 business again every certain cycle (can much larger than the MAP cycle).

For realizing the E1 business, on DOCSIS agreement basis, done certain expansion, use a kind of frame interior, the definition in each territory is shown in Table 1 in the frame structure.

In the step 1 of above-mentioned up transmission, be no more than 5ms, in each MAP, need so same E1 business is carried out repeatedly data grant by the maximum transmitting time delay of standard-required E1 business in system.The time-delay of E1 business can not be above standard like this.

In primary MAP frame, data grant is carried out in each terminal E1 Frame transmission opportunity.Later on each base station no longer licenses to the E1 business in the MAP frame, do not make other purposes during this period of time but also do not specify.Terminal is preserved transmission opportunity and transmission cycle, still sends the E1 Frame according to certain cycle opportunity in transmission.When transmission need change opportunity, (increase or reduce the circuit number of N * 64K as certain terminal), send the MAP frame again, the transmission of E1 business is authorized opportunity.

Relate to specific identification code in the step 4 of above-mentioned up transmission, the reservation PDU frame head with reference to the DOCSIS mac frame is decided to be 0x8C with E1 data frame head, and principle is not repeat with the frame head (mainly being management frames and Frame) of other type.

The purpose one of using above-mentioned special frame head is in order to use hardware quickly and easily E1 traffic frame and the difference of IP Frame to be come; The 2nd, in order to pare down expenses.For each terminal, E1 frame length relative fixed does not have the source and destination MAC Address, does not therefore need a complete DOCSIS agreement mac frame head.And the transmission of E1 frame is more frequent, uses short inside frame head can save certain frame head expense; The 3rd, in order to distinguish different terminals.In inner frame head, to comprise simple terminal number, be used for distinguishing E1 frame head from different terminals.

Relate to mpeg frame in the step 2 of above-mentioned descending transmission, the Bandwidth Management of descending E1 business is mainly realized by hardware.The Bandwidth Management of descending E1 business is actually the distribution to the mpeg frame payload.In base station side, the E1 data of coming in by two E1 interfaces through string-and conversion after, according to the queuing Control Parameter that the webmaster assignation information is produced, finish the interconnection of Circuit Service, order enters downstream circuitry Business Stream FIFO.Framing, sequencing control and transtation mission circuit are according to the professional kind mpeg frame that produces of webmaster assignment E1 simultaneously.

Wherein two territories of P Circuit Service pointer and Circuit Service payload are optional territory, are determined it to have or not and are taken byte number by the configuring condition of E1 business.Under the situation that non-full configuration is put, the byte of these two territory remainders can be used as the data service payload.

For data service, can be the mpeg frame head, the Circuit Service pointer field, the length of Circuit Service payload is all regarded the part of physical layer as, is sightless to it.A Frame may be separated in several data service payload field transmission.Here also comprise the special MAC frame.Notice that the SYNC frame is special, cannot be interrupted, guarantee that it is in the professional payload field transmission of data by hardware.

The invention solves the problem that is not fit to the over-the-air protocol of BWA, particularly it makes BWA that the E1 business can be provided, improve the range of application of DOCSIS agreement, increased the type service that BWA provided.

Description of drawings

Fig. 1 is general mac frame structure;

Fig. 2 is a standard mac frame head form;

Fig. 3 is the mac frame head form that is used for E1 that expands;

Fig. 4 is a DOCSIS MPEG packet format;

Fig. 5 is the mpeg frame structure that can be used for E1 that expands;

Fig. 6 is the flow chart of the up transmission of E1 data among the present invention;

Fig. 7 is the flow chart of the descending transmission of E1 data among the present invention.

Embodiment

As shown in Figure 6, the present invention is based in the comprehensive switch on business implementation method of air bandwidth resource, the E1 data are finished up transmission by following steps:

1) generates allocated bandwidth and shine upon (MAP) figure to determine the transmitting time of up E1 data with fixed cycle;

2) terminal is according to the MAP of described generation figure, and the transmitting time of E1 data is write hardware register;

3), send the E1 data according to the transmitting time in the described hardware register;

4) base station receives described E1 data according to special identification code.

As shown in Figure 7, the present invention is based in the comprehensive switch on business implementation method of air bandwidth resource, the E1 data are finished descending transmission by following steps:

1) the E1 service parameter is set in hardware register;

2) hardware is provided with in mpeg frame according to described parameter and is specifically designed to the zone that sends the E1 data;

3) the E1 data being put into above-mentioned zone sends.

Fig. 1 is the general mac frame structure of DOCSIS, and as can be seen from Figure 1,3 territories are arranged in the general mac frame structure: before the mac frame is a physical media (PMD) sublayer expense (up) or a mpeg stream packet header (descending); The first of mac frame is MAC packet header, and this MAC packet header has identified the content of mac frame uniquely; After the packet header is optional data PDU territory.The form of data PDU and having or not in MAC packet header defines.

Fig. 2 is the general mac frame head of a DOCSIS form, and general MAC packet header all should have general frame head form shown in Figure 2, and each territory is as shown in table 1 in the form, and frame control (FC) territory is first byte, identifies all the other contents in the MAC packet header uniquely; Behind the FC territory 3 byte MAC control domains, an optional expanding packet header field (EHDR) and a packet header checking sequence (HCS).

Table 1

Territory, MAC packet header	Usage	Length
Territory, MAC packet header	Usage	Length	FC	Frame control: the type in sign MAC packet header	8 bits
MAC_PARM	Parameter field, usage depends on FC: if EHDR_ON=1 is used for EHDR length (ELEN); In the cascade frame, (see mistake! Do not find Reference source.) be used for the MAC frame count; Or the number (only being used for request message) of the expression mini-slot of being asked	8 bits	FC	Frame control: the type in sign MAC packet header	8 bits
MAC_PARM		8 bits	LEN (SID)	The length of mac frame.Be defined as the byte number in the extension header and the summation of the byte number behind the HCS territory.(for the packet header of request message, this territory is substituted by traffic ID)	16 bits
EHDR	Extended MAC packet header (variable-length)	The 0-240 bit	LEN (SID)		16 bits
EHDR	Extended MAC packet header (variable-length)	The 0-240 bit	HCS	MAC packet header verification sequence	2 bytes
	The length in MAC packet header	6 bytes+EHDR	HCS	MAC packet header verification sequence	2 bytes

Wherein the HCS territory is the CRC of one 16 bit, is used to guarantee the integrality in MAC packet header.It should cover whole M AC packet header, from the FC territory, and comprises the EHDR territory that is occurred.CRC (the x that this HCS defines with ITU-T suggestion X..25 ¹⁶+ x ¹²+ x ⁵+ 1) calculates.

Wherein, the FC territory is divided into FC-TYPE subdomain, FC-PARM subdomain and an EHDR_ON Warning Mark, and its form sees Table 2.Wherein the FC_TYPE subdomain is the highest two bits in FC territory, one of 4 kinds of mac frame forms that these two bits express possibility: the MAC packet header of bag PDU; The MAC packet header of ATM cell; The MAC packet header that keeps in the future PDU type; Or be used for MAC packet header of specific MAC control.

Table 2

The FC territory	Usage	Length
The FC territory	Usage	Length	FC_TYPE	Mac frame control types territory 00: the MAC packet header 10 of the MAC packet header 01:ATM PDU of bag PDU: the specific packet header of 11:MAC, MAC packet header that keeps PDU	2 bits
FC_PARM	The parameter bit, usage depends on FC_TYPE	5 bits	FC_TYPE		2 bits
FC_PARM	The parameter bit, usage depends on FC_TYPE	5 bits	EHDR_ON	During EHDR_ON=1, expression has EHDR territory (length of EHDR (ELEN) is determined by the MAC_PARM territory)	1 bit

5 bits of FC_TYPE back are the FC_PARM subdomains, and the usage of these bits depends on the type in MAC packet header; The significant bits in FC territory is the EHDR_ON designator, if this bit is 1, then expression has extension header (EHDR).

Transmission Convergence Sub-layer byte of padding sign indicating number type is defined as 0xFE, and this makes the FC byte combination of FC_TYPE=11 and FC_PARM=11111 should not occur.

According to the FC territory, there is multiple use in the MAC_PARM territory in MAC packet header, if the EHDR_ON designator puts 1, then the MAC_PARM territory is applied to extension header length (ELEN), and the EHDR length of field can change between 0 to 240 byte; If this is a cascade MAC packet header, the number (CNT) of cascade mac frame is represented in the MAC_PARM territory so; If this is a request message MAC packet header (REQ), the MAC_PARM domain representation bandwidth number of being asked so.Under other situation, the MAC_PARM territory keeps to be done to use in the future.

There are two kinds of possible usages in the 3rd territory, and in most cases, it indicates the length (LEN) of this mac frame; In particular cases a kind of, promptly in request message MAC packet header, owing to do not follow PDU behind the MAC packet header, it is used to indicate CM ID.

Extension header (EHDR) territory provides expansion for the mac frame form.It is used for time slot data link security, frame segmentation, and the extendible function of supporting that future version increases of being used for.In elementary realization, this territory should be submitted to processor.Software upgrading later on just can be benefited from this ability.

MAC packet header can be later on a data PDU, and the type of data PDU and form define in the frame control domain in MAC packet header.The FC territory has clearly defined bag data PDU, ATM data PDU, MAC particular frame and a reservation coding (the escape mechanism when being used for doing expansion in the future).All CM should use the length field in the MAC packet header to skip all retention datas.

Fig. 3 is the mac frame head form that is used for E1 that DOCSIS expands.Reservation PDU frame head with reference to the DOCSIS mac frame is decided to be 0x8C with E1 data frame head, and principle is not repeat with the frame head (mainly being management frames and Frame) of other type.

Up channel is actually the data flow of being made up of mini-slot, and CMTS must can generate the timing reference that is used to discern these time slots, and in addition, it also must be controlled CM and insert these time slots.For example it can be used to send data PDU for CM authorizes some continuous slot.CM must receive in the official hour reference to guarantee CMTS according to regularly requiring to send data.The protocol elements of using in request, mandate and the upstream bandwidth distribution will be described below.Wherein, the allocated bandwidth Management Mechanism is to distribute MAP.

Distributing MAP is the MAC administrative messag that the CMTS down channel sends, and it has described the moment that up mini-slot sends.Given MAP can specify some time slot to send the mandate of data as specific station, and some time slot is used for the competition transmission, and other time slot is that new website adds incoming link and offers an opportunity.

Fig. 4 is the general mpeg format of DOCSIS, and it comprises the MPEG expense of 4 bytes, a pointer field (not being all to exist in all bags) and net load.Wherein the MPEG net load is used to carry mac frame.

Fig. 5 is the mpeg format that the present invention expands, and it comprises the MPEG expense of 4 bytes, a pointer field (not being in all bags, all to exist), and the net load front portion is the Circuit Service payload, the rear portion is other professional payload.

Compare with the general mpeg format of DOCSIS, the present invention has increased the Circuit Service payload.

Guarantee about the delay of E1 business, be no more than 5ms by the maximum transmitting time delay of standard-required E1 business in system, so at each MAP) in need same E1 business is carried out repeatedly secondary data mandate.The time-delay of E1 business can not be above standard like this.

The present invention expands the DOCSIS agreement and improves, and this agreement can be applied to BWA, particularly after improving, can guarantee that BWA provides the E1 that satisfies certain maximum delay business.

Claims

1, a kind of comprehensive switch on business implementation method based on the air bandwidth resource is carried out the up transmission and the descending transmission of E1 data between terminal and base station, it is characterized in that,

2, according to the described comprehensive switch on business implementation method of claim 1 based on the air bandwidth resource, it is characterized in that, the transmitting element that carries out the MAC layer of uplink and downlink between base station and the terminal is the mac frame of variable-length, comprising: the mac frame of the bag data PDU bag of the ethernet type of support variable-length; The mac frame that the ATM cell of ATM PDU is arranged in the expression frame; The mac frame that keeps in the future PDU type; The mac frame that is used for specific MAC control.

3, according to the described comprehensive switch on business implementation method of claim 1 based on the air bandwidth resource, it is characterized in that, carry out the up channel that the E1 data uplink sends and comprise the data flow that mini-slot is formed, described base station generates and sends the timing reference that can discern these time slots and the access slot of control terminal.

4, according to the described comprehensive switch on business implementation method of claim 1 based on the air bandwidth resource, it is characterized in that, described allocated bandwidth mapping (MAP) comprises by the MAC administrative messag of base station in the variable-length of down channel transmission, the transmission opportunity of definition up channel, described MAC administrative messag comprises fixed length letter head and information element IE, and each information element has defined the scope that allows the mini-slot of use.

5, according to the described comprehensive switch on business implementation method of claim 1 based on the air bandwidth resource, it is characterized in that, the base station periodically provides fixing data transfer bandwidth for Business Stream, the professional professional way of opening according to this terminal of E1 is set up Business Stream for the E1 data flow of each terminal, specify relevant parameter, then this Business Stream is activated, distribute SID.

6, according to the described comprehensive switch on business implementation method of claim 1 based on the air bandwidth resource, it is characterized in that, may further comprise the steps: for the E1 business, in primary MAP frame, data grant is carried out in each terminal E1 Frame transmission opportunity, terminal is preserved transmission opportunity and transmission cycle, send the E1 Frame opportunity in transmission according to certain cycle, but when need changing opportunity, transmission sends the MAP frame, transmission to the E1 business is authorized opportunity, or, again the E1 business is once sent mandate every certain cycle.

7, according to the described comprehensive switch on business implementation method of claim 6 based on the air bandwidth resource, it is characterized in that, described mandate is included in to expand on the DOCSIS agreement basis uses a kind of frame interior, in each MAP, need same E1 business is carried out repeatedly data grant, in primary MAP frame, data grant is carried out in each terminal E1 Frame transmission opportunity.

8, according to the described comprehensive switch on business implementation method of claim 1 based on the air bandwidth resource, it is characterized in that, described mandate comprises terminal preservation transmission opportunity and transmission cycle, send the E1 Frame according to some cycles opportunity by transmission, when transmission need change opportunity, send the MAP frame, the transmission of E1 business is authorized opportunity.

9, according to the described comprehensive switch on business implementation method of claim 1 based on the air bandwidth resource, it is characterized in that, described base station receives specific identification code in the described E1 data according to special identification code, with reference to the reservation PDU frame head of DOCSIS mac frame, E1 data frame head is decided to be 0x8C or other number that repetition does not take place with the frame head of other type.

10, according to the described comprehensive switch on business implementation method of claim 1 based on the air bandwidth resource, it is characterized in that, described hardware is according to described parameter, in mpeg frame, be provided with and be specifically designed to the zone that sends the E1 data, mpeg frame is wherein realized by hardware in descending E1 business, in base station side, from the data of two E1 interfaces through string-and conversion after, the queuing Control Parameter that is produced according to the webmaster assignation information, finish the interconnection of Circuit Service, order enters downstream circuitry Business Stream FIFO, the while framing, sequencing control and transtation mission circuit are according to the professional kind mpeg frame that produces of webmaster assignment E1, wherein two territories of P Circuit Service pointer and Circuit Service payload are optional territory, determine it to have or not and take byte number by the configuring condition of E1 business, under the situation that non-full configuration is put, the byte of these two territory remainders can be used as the data service payload.