CN101277163A

CN101277163A - Light synthetic switching OIS network based on WDM capable of supporting WiMAX multi-service transmission

Info

Publication number: CN101277163A
Application number: CNA2007100909781A
Authority: CN
Inventors: 高泽华
Original assignee: Beijing University of Posts and Telecommunications
Current assignee: Beijing University of Posts and Telecommunications
Priority date: 2007-03-30
Filing date: 2007-03-30
Publication date: 2008-10-01
Anticipated expiration: 2027-03-30
Also published as: CN101277163B

Abstract

The invention provides a new type optical integrated switch OIS network supporting WinMAX (IEEE802.16e) multi-service transmission. In OIS, service types are divided into four types for supporting various service type in WinMAX respectively.

Description

Support the light based on WDM of WiMAX multi-service transmission comprehensively to exchange the OIS network

Technical field

The present invention relates to optical communication network and WiMAX wireless communication technology, relate in particular to and support the multiple services novel light of WiMAX comprehensively to exchange OIS ring network technology based on WDM.

Background technology

At WiMAX[IEEE Std 802.16e] in the business supported, type of service is divided into 5 kinds: the 0th kind is the professional UGS of fixed-bandwidth, the 1st kind is the professional RT-VR of real-time variable bit rate, the 2nd kind is the professional NRT-VR of Non-Real Time Variable Bit Rate, the 3rd kind is Best-Effort service BE, the 4th kind of professional ERT-VR of the real-time variable bit rate for expansion.Wherein: the 0th kind of professional UGS fixed-bandwidth business, as T1/E1; The 1st kind of professional RT-VR of business support real-time variable bit rate is as the MPEG video traffic; The 2nd kind of professional NRT-VR supports to guarantee data rate but to the insensitive business of time delay; The 3rd kind of professional BE supports that data speed and time delay the Best-Effort service that does not require, as Email; The 4th kind of professional ERT-VR support variable data rate has the business of requirement, simultaneously as the VOIP business of band silence compression to data speed and time delay.

Along with the quick growth of IP data service, IP over WDM becomes clear day by day as the core technology of future IP network.Light switching technology in the optical-fiber network mainly contains the exchange of circuit light (OCS), light packet switching (OPS) and the light burst-switched (OBS) of light at present.

Optical-fiber network based on OCS can be supported well to circuit-switched service, but efficient is very low when bearer IP service, and at present be that the miscellaneous service demand of core sharply increases with the data service, make telecommunications transmit network from traditional serve as mainly to develop with the voice-over business to direction based on bearing data service, characteristics such as the asymmetry that data service had, dynamic, sudden, diversity are different from stable voice service characteristic fully, have proposed dynamically, carried out in real time the requirement that business provides to transmitting network.

Be support circuit switched service, IP Packet Service and following other business that may occur, OPS will be a following light switching technology of supporting miscellaneous service.OPS is a kind of fine-grained exchanging mechanism, because it allows statistic multiplexing network channel bandwidth resources etc., the therefore data service that is particularly suitable for happening suddenly.But do not have optical logic device at a high speed at present, do not have the random access storage device that resembles electric territory in the light territory.

In a word, though the circuit switching comparative maturity of light, it is not suitable for having paroxysmal IP data service.At present, OPS is faced with the technology barrier that is difficult to overcome again.

In recent years, the foreign scholar has proposed a kind of new light switching technology: light burst-switched (OBS:Optical Burst Switching).OBS combines the advantage of OCS and OPS and has avoided their shortcoming, overcome the shortcoming of light path exchange (granularity is big, dumb, efficient low) and light packet switching (sun adjuster spare requires high, be difficult to realize), and take into account their advantage, have bandwidth efficiency height, throughput height, be easy to advantage such as realization, therefore research at present is very many.

OBS is cross-over unit with the light burst, by in independent channel (generally being independent wavelength), transmitting control message in advance, so that reserve the required resource of its corresponding burst packets, follow-up core node is in electric territory or light territory control message processing, reserve and the configuration related resource, acknowledge messages such as burst packets does not need, by the good link of configured in advance, (full light) arrives destination node pellucidly, it by way of intermediate node do not need it is made any identification or relevant treatment, only it need be carried out wavelength conversion, delay by pre-configured information.

In the OBS looped network, the OBS node corresponding to each burst, forms a burst control grouping (BCP), to carry the exchange of control information of this burst dressing up by burst packets (Burst) from the data set of WiMAX base station.

OBS has bandwidth efficiency height, throughput height, be easy to advantage such as realization, but this OBS has good performance to the circuit-switched service difficulty.

Summary of the invention

The objective of the invention is to avoid above-mentioned deficiency, and propose the light switching technology of a kind of novel support WiMAX: light comprehensively exchanges OIS (OIS-Optical Integrative Switching) network technology, so that more effectively support the WiMAX multiple business.

To achieve these goals, the present invention is by the following technical solutions:

Optical-fiber network mainly contains looped network and mesh network, the present invention is an example with a kind of looped network based on WDM, comprehensively exchange in the looped network at the light based on WDM, destination node solves the receiving port conflict with a plurality of receiving ports, and its receiving port can be realized quick wavelength selective reception to wavelength.

In supporting the multiple services OIS of WiMAX, type of service is divided 4 classes, the professional UGS of the 0th kind of fixed-bandwidth among the 0th class (class0) the business support WiMAX; The professional ERT-VR of real-time variable bit rate of professional RT-VR of the 1st kind of real-time variable bit rate among the 1st class (class1) the business support WiMAX and the 4th kind of expansion; The professional NRT-VR of the 2nd kind of Non-Real Time Variable Bit Rate among the 2nd class (class2) the business support WiMAX; The 3rd kind of Best-Effort service BE among the 3rd class (class3) the business support WiMAX.

Light comprehensively exchanges OIS ring network environment of applications for based on the unidirectional looped network of the OIS of WDM, and n node arranged, and each node can connect several WiMAX base station.

N * m+1 wavelength arranged in the OIS looped network, and wherein n * m wavelength is used for passing the data burst bag, and the n * m+1 wavelength is used for carrying control frame.Control frame moves with the method for synchronization in the whole network.Corresponding n * m the WDM wavelength of n * m transmit port arranged in the whole OIS looped network, and each OIS node has the different wavelength of the corresponding WDM of m data transmit port, m optionally connected receiving end mouth.The corresponding receipts of m light outlets is used for sending and the reception burst packets.Node can be with the local wavelength of any one free time, and an idle receiving port can any one wavelength that sends of selective reception.Before m data receiving port of destination node, a selective reception equipment is arranged, be used for down road m data wavelength and a control channel wavelength.

Each OIS node connects several WiMAX base stations, from Access Network to the looped network direction, the OIS node converges buffer memory queuing transmission to the data of Access Network by type of service, according to destination node, convergence in different packets, packet with the form transmission of light, does not need through electro-optical conversion at intermediate node in looped network.From the looped network to the Access Network, the OIS node need to select the packet of reception, issues corresponding Access Network through electric treatment.

The packet of local node is put in the different transmission logic transmit queues according to destination node and type of service.The transmission of control signal takies a control channel wavelength specially.

Because adopt technique scheme, the present invention has the following advantages and effect:

1, supporting the multiple services light based on WDM of WiMAX comprehensively to exchange among the looped network OIS, type of service is divided 4 classes, the professional UGS of the 0th kind of fixed-bandwidth among the 0th class (class0) the business support WiMAX; The professional ERT-VR of real-time variable bit rate of professional RT-VR of the 1st kind of real-time variable bit rate among the 1st class (class1) the business support WiMAX and the 4th kind of expansion; The professional NRT-VR of the 2nd kind of Non-Real Time Variable Bit Rate among the 2nd class (class2) the business support WiMAX; The 3rd kind of Best-Effort service BE among the 3rd class (class3) the business support WiMAX.The business of front is than the service priority height of back.

2, adopt the present invention can utilize the network bandwidth better, circuit-switched service is provided the service of guarantee; Receiving port is to all kinds of professional conflicts of not having; Business is classified, OIS has extraordinary support to the multiple business of WiMAX, the situation of more realistic WiMAX network carrying miscellaneous service, make OIS have practicality more, has competitiveness more than OCS, OBS network, more go a step further than OBS to OPS, overcome OBS to circuit-switched service support ineffective, avoided the high request of OPS sun adjuster spare simultaneously.

Description of drawings

Fig. 1 is OIS ring network structure figure

OIS looped network node structure chart when Fig. 2 is m=2

Among the figure: OISN is the OIS looped network node, and OISR is the OIS looped network, and BS is the WiMAX base station, and CPL is a coupler, and RxC is the control channel receiver, and TxC is the control channel reflector, and Rx is the data channel receiver, and Tx is the data channel reflector.

Embodiment

As seen from Figure 1, light comprehensively exchanges OIS ring network environment of applications for based on the unidirectional looped network of the OIS of WDM, and n node arranged, and each node can connect several WiMAX base station.

As seen from Figure 2, the OIS looped network node OISN when m=2, the packet of local node is put in the different transmission logic transmit queues according to destination node and type of service.

The transmission of control signal takies a control channel wavelength specially.

It is the cycle that the data slot of receiving port is selected 125 μ s, is in order to adapt to existing telephone network (also comprising the SDH network), can to support fixed-bandwidth professional as E1 better.Sending node can send data according to time slot situation in the 125 μ s cycles of receiving port.

Claims

1. support the light based on WDM of WiMAX multi-service transmission comprehensively to exchange the OIS network for one kind, it is characterized in that: in supporting the multiple services OIS of WiMAX, type of service is divided 4 classes, the professional UGS of the 0th kind of fixed-bandwidth among the 0th class (class0) the business support WiMAX; The professional ERT-VR of real-time variable bit rate of professional RT-VR of the 1st kind of real-time variable bit rate among the 1st class (class1) the business support WiMAX and the 4th kind of expansion; The professional NRT-VR of the 2nd kind of Non-Real Time Variable Bit Rate among the 2nd class (class2) the business support WiMAX; The 3rd kind of Best-Effort service BE among the 3rd class (class3) the business support WiMAX.

2. the light based on WDM of support WiMAX multi-service transmission according to claim 1 comprehensively exchanges the OIS network, it is characterized in that: mainly contain mesh network and ring network (looped network).

3. ring network according to claim 2, it is characterized in that: the OIS network is the OIS ring network, comprehensively exchange in the looped network at the light based on WDM, destination node solves the receiving port conflict with a plurality of receiving ports, and its receiving port can be realized quick wavelength selective reception to wavelength.

4. the light based on WDM of support WiMAX multi-service transmission according to claim 1 comprehensively exchanges the OIS network, and it is characterized in that: network application environment has n node for based on the unidirectional looped network of the OIS of WDM, and each node can connect several WiMAX base station; N * m+1 wavelength arranged in the OIS looped network, and wherein n * m wavelength is used for passing the data burst bag; The n * m+1 wavelength is used for carrying control frame, and the control wavelength distributes fixedly time slot for each node; Control frame moves with the method for synchronization in the whole network; Corresponding n * m the WDM wavelength of n * m transmit port arranged in the whole OIS looped network, and each OIS node has the different wavelength of the corresponding WDM of m data transmit port, m optionally connected receiving end mouth; The corresponding receipts of m light outlets is used for sending and the reception burst packets, node can be with the local wavelength of any one free time, idle receiving port can any one wavelength that sends of selective reception, each node has m receiving port, before m data receiving port of destination node, a selective reception equipment is arranged, be used for down road m data wavelength and a control channel wavelength; Each OIS node connects several WiMAX base stations, from Access Network to the looped network direction, the OIS node converges buffer memory queuing transmission to the data of Access Network by type of service, according to destination node, convergence in different packets, packet with the form transmission of light, does not need through electro-optical conversion at intermediate node in looped network; From the looped network to the Access Network, the OIS node need to select the packet of reception, issues corresponding Access Network through electric treatment; The packet of local node is put in the different transmission logic transmit queues according to destination node and type of service; The transmission of control signal takies a control channel wavelength specially, and n node arranged in the looped network, and each node has m receiving port and m transmit port.