CN104601316B - The multi-link group system and its method of allocating transmission channels of wide and narrow strip fusion - Google Patents

The multi-link group system and its method of allocating transmission channels of wide and narrow strip fusion Download PDF

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CN104601316B
CN104601316B CN201510053536.4A CN201510053536A CN104601316B CN 104601316 B CN104601316 B CN 104601316B CN 201510053536 A CN201510053536 A CN 201510053536A CN 104601316 B CN104601316 B CN 104601316B
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channel
base station
broadband
narrow
user
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CN104601316A (en
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粟欣
许希斌
林小枫
肖驰洋
曾捷
赵明
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清华大学
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Abstract

The present invention relates to the multi-link group system and its method of allocating transmission channels of a kind of wide and narrow strip fusion, belong to wireless communication technology field.The system includes the broadband trunked base station based on TD LTE, PDT arrowbands trunked base station, n a digital trunking user terminal, the Digital Clustering user terminal has broadband reception interface and narrow-band reception interface simultaneously, and the broadband reception interface and narrow-band reception interface of each Digital Clustering user terminal are connected by wideband digital collection group channel and narrow-band digital collection group channel with the broadband trunked base station based on TD LTE, PDT arrowbands trunked base station respectively simultaneously.This method includes:When call subscriber terminal is to PDT arrowbands trunked base station initiation setup requests, by wired interconnection between PDT arrowbands trunked base station and TD LTE broadbands trunked base station, joint is subjected to physical layer resources distribution;The inventive method can improve the spectrum utilization efficiency in digital cluster communication, lift the service experience of cluster user, realize the wide and narrow strip fusion of digital cluster communication.

Description

The multi-link group system and its method of allocating transmission channels of wide and narrow strip fusion

Technical field

The invention belongs to wireless communication technology field, the more particularly to multi-link group system of wide and narrow strip fusion and its transmission Method for channel allocation, broadband refer to the wideband digital cluster based on TD-LTE, and arrowband refers to PDT digital cluster systems.

Background technology

LTE (Long Term Evolution, Long Term Evolution) is by 3GPP (The 3rd Generation Partnership Project, third generation partner program) UMTS (the Universal Mobile that organize to set up Telecommunications System, UMTS) technical standard Long Term Evolution, be after the third generation move Next-generation mobile communications standard after communication.TD-LTE is time division duplex (TDD, Time Division Duplex) pattern LTE system.TD-LTE using OFDM (Orthogonal Frequency Division Multiplexing, OFDM) drilled with multiple-input and multiple-output (Multiple-Input Multiple-Output, MIMO) technology as its wireless network The standard entered.Descending 100Mbps and up 50Mbps hardware circuit solution can be provided under 20MHz spectral bandwidths;Using Complete IP network framework, network structure flattening develop, and effectively shorten the time delay of chain of command and user plane;System up-downgoing chain Road uses same frequency range, without symmetrical spectrum, has inherent advantage in the case where frequency spectrum resource is in short supply;Pass through smart antenna MIMO technology can effectively improve wireless frequency spectrum efficiency, can effectively reduce processing complexity, and uplink and downlink timeslot flexibly matches, branch Hold non-symmetrical spectrum and non-symmetrical service;Channel resource can be made full use of, the reception and transmission of base station can be with common sparing radio frequencies Unit, the manufacturing cost of base station is reduced to a certain extent.TD-LTE system channel capacity is big, the availability of frequency spectrum is high, anti-dry Immunity ability is strong.Compared to PDT digital cluster systems, the wideband digital company-data transmission rate based on TD-LTE is high, can prop up Hold the voice, video, image transmitting of high quality;But there is also inferior position, such as voice real-time simultaneously to compare weaker, propagation delay time phase It is higher, and base station covering power is compared weaker, business is easily influenceed by base station covering power.

In LTE technologies, wave point is the interface between user terminal and base station eNodeB, also referred to as air interface.Nothing Line interface is wide-open interface, as long as observing interface specification, the equipment of different manufacturer's productions is with regard to that can communicate.Wirelessly Protocol stack of the interface is divided into three layers of two sides, and three layers include physical layer, data link layer and Internet, and two sides refers to user plane and control Face.Data link layer is located at chain of command and user plane simultaneously, is responsible for the transmission and encryption of user service data in user plane.It is based on TD-LTE wideband digital trunked communication system, not only with point-to-point unicast communication mechanism, also directed to the need of cluster communication Ask with the cluster communication mechanism for being applicable point-to-multipoint.The downlink service data of the communication mechanism transmits, under its data link layer Row structure is as shown in figure 1, including media access control (Medium Access Control, MAC) layer, wireless spread-spectrum technology (Radio Link Control, RLC) layer and PDCP (Packet Data Convergence Protocol, PDCP) layer.The function that MAC layer is supported mainly includes:The mapping of logic channel and transmission channel, multiple users set The channel priority processing of dynamic dispatching, unique user equipment UE between standby UE, multiplex/demultiplex, passes through mixed automatic retransfer HARQ is asked to carry out error correction etc.;The major function that rlc layer is supported includes:Error correction is carried out by HARQ ARQ, it is right Transmission block carries out being segmented Segm processing etc.;The function that PDCP layers are supported mainly includes:Use robust header compressed (Robust Header Compression, ROHC) agreement enters wardrobe compression and decompression to IP traffic, user plane and chain of command data Transmission, encryption and decryption etc..

PDT (Professional Digital Trunking, pro digital cluster) standard is taken the lead by the Chinese Ministry of Public Security The industry special digital cluster standard that domestic cluster manufacturer formulates.Due to technology maturation, it is big (in) covering of area's system, networking cost It is low, Survivabilities of Networks is strong, spectrum requirement is low, level security is high, meets private network user's use habit, still possess so far very strong Vitality, be current wireless dispatching commander first choice.The professional user groups such as public safety, public utilities, industry and commerce can be met The voice demand of the radio communication command scheduling of body.But the business supports such as user's active demand high-quality speech, video, image.

Wideband digital collection group energy based on TD-LTE provides the data capability support of superelevation, supports HD video, multimedia Distribution, high-speed data service, efficient data support is provided for commanding and decision-making;Meanwhile have benefited from LTE flat architecture, it is based on TD-LTE wideband digital cluster the same characteristic that can also support the professional cluster such as ultrafast connecting time with narrowband speech cluster; But the wideband digital cluster based on TD-LTE do not support the covering of great Qu systems, networking and maintenance cost is of a relatively high, spectrum requirement compared with Greatly.Two kinds of technologies respectively have feature, complemented one another.Under the conditions of current technology, wide and narrow strip fusion is very real and favourable Selection, two kinds of technological incorporation symbiosis, learns from other's strong points to offset one's weaknesses, user, can be according to the different need in specific region in the scope of business of oneself Ask flexibly selection narrowband speech or the covering of wideband digital cluster.

The terminal that multi-connection technology refers to possessing multiple network interfaces is by different access technologies while is connected to not With the technology of network.The carrier bandwidths and multi-user resource for being limited to single standard are shared, and single standard transmission is difficult to meet to use The requirement of family peak rate.In addition, in the case that every kind of standard has substantial amounts of users to share bandwidth, single standard transmission Difficulty meets requirement of the user to lasting downloading rate or streaming media speed.Multi-link purpose is by multiple networks Joint resource management, realize the load sharing between different access systems, improve the availability of frequency spectrum on the whole, improve business number According to speed, Consumer's Experience is lifted.

The content of the invention

The purpose of the present invention is to overcome the weak point of prior art, proposes a kind of multi-link cluster of wide and narrow strip fusion System and its method of allocating transmission channels, the present invention can improve the spectrum utilization efficiency in digital cluster communication, and lifting cluster is used The service experience at family, realize the wide and narrow strip fusion of digital cluster communication.A kind of wide and narrow strip proposed by the present invention merges multi-link Group system, it is characterised in that the system includes the broadband trunked base station based on TD-LTE, PDT arrowbands trunked base station, n number Word trunking user terminal, the Digital Clustering user terminal have broadband reception interface and narrow-band reception interface simultaneously, per number The broadband reception interface and narrow-band reception interface of word trunking user terminal pass through wideband digital collection group channel and arrowband respectively simultaneously Digital Clustering channel is connected with the broadband trunked base station based on TD-LTE, PDT arrowbands trunked base station;Broadband collection based on TD-LTE Group base station, PDT arrowbands trunked base station are used to Digital Clustering simultaneously by wideband digital collection group channel and narrow-band digital collection group channel Family transmission signal, while be Digital Clustering user terminal co-allocation wideband digital collection group channel and narrow-band digital collection group channel. The co-allocation of the multi-link group system transmission channel of described wide and narrow strip fusion is in the broadband trunked base station based on TD-LTE New interface is established between PDT arrowbands trunked base station, makes wide, the wired interconnection of arrowband trunked base station, with intercommunication physical layer The data-signal that resource and needs transmit.

The present invention also proposes the multi-link group system method of allocating transmission channels merged using the wide and narrow strip of said system, Characterized in that, establish call:When call subscriber terminal is to PDT arrowbands trunked base station initiation setup requests, PDT is narrow By wired interconnection between band trunked base station and TD-LTE broadbands trunked base station, joint is subjected to physical layer resources distribution;Including Following steps:

(1) receiving end judges that signal is signaling or data service first, if signaling, then distributes narrow band channel transmission letter Order, transmission channel distribution terminate;If data service, then step (2) is continued executing with;

(2) PDT arrowbands trunked base station carries out physical layer resources according to the priority of data traffic types and called party Distribution, carry out broadband, the preliminary co-allocation of narrow-band transmission channel;

(3) transmission channel distribution is completed according to actually available broadband, narrow band channel quantity.

The technical characterstic and beneficial effect of the present invention:

The present invention based on multi-link group system, avoid single standard to bandwidth and user's peak rate limit System, by multiple network association resource managements, spectrum utilization efficiency is improved on the whole, improves traffic data rate.To width Band transmission channel carries out co-allocation, broadband technology and narrow-band technologies is complemented one another and is learnt from other's strong points to offset one's weaknesses, compensate for narrow band transmission number According to the inferior position that speed is low He broadband covering power is weak, propagation delay time is high, the spectrum utilization efficiency in digital cluster communication is improved, is carried The service experience of cluster user is risen, realizes the wide and narrow strip fusion of digital cluster communication.

Brief description of the drawings

Fig. 1 is the descending structural representation of data link layer of the wideband digital group system based on TD-LTE;

Fig. 2 is the multi-link group system structural representation of the present invention;

Fig. 3 is that the data link layer user surface of the multi-link group system of the present invention couples descending structural representation;

Fig. 4 is the multi-link group system method of allocating transmission channels flow chart of the present invention.

Embodiment

The multi-link group system and its method of allocating transmission channels combination accompanying drawing of wide and narrow strip proposed by the present invention fusion and Embodiment is further described below:

The composition of the multi-link group system of the wide and narrow strip fusion of the present invention is as shown in Figure 2.Including the width based on TD-LTE Band trunked base station, PDT arrowbands trunked base station, n digital trunking user terminals, the Digital Clustering user terminal have width simultaneously Band receiving interface and narrow-band reception interface, the broadband reception interface and narrow-band reception interface of each Digital Clustering user terminal are simultaneously Pass through wideband digital collection group channel and narrow-band digital collection group channel and the broadband trunked base station based on TD-LTE, PDT arrowbands respectively Trunked base station is connected;Broadband trunked base station, PDT arrowbands trunked base station based on TD-LTE pass through wideband digital collection group channel and narrow Band Digital Clustering channel is Digital Clustering user terminal co-allocation broadband number simultaneously to Digital Clustering user's transmission signal Word collection group channel and narrow-band digital collection group channel.The joint point of the multi-link group system transmission channel of described wide and narrow strip fusion Fit over and establish new interface between the broadband trunked base station based on TD-LTE and PDT arrowbands trunked base station, make wide, the arrowband collection Group's wired interconnection in base station, with intercommunication physical layer resources and need the data-signal transmitted.

The multi-link group system of described wide and narrow strip fusion, there is point-to-point unicast communication mechanism, point-to-multipoint Cluster communication mechanism, and merged wideband digital cluster and PDT digital cluster systems based on TD-LTE.Therefore described collection On the Radio interface protocols stack of group's system, also formed the TD-LTE user face protocol stack corresponding with wide and narrow strip fusion and PDT without Coupled structure between line interface protocol stack.The data link layer user surface of the communication mechanism couples descending structure, such as Fig. 3 institutes Show;I.e. in the follow-up access element PDT converters of rlc layer addition of original LTE data link layers, PDT base stations are added in MAC layer, So that rlc layer also accesses PDT converters simultaneously after segmentation, HARQ, and in MAC layer access PDT base stations.

The multi-link group system method of allocating transmission channels of wide and narrow strip fusion proposed by the present invention, its flow such as Fig. 4 institutes Show, establish call:Call subscriber terminal to PDT arrowbands trunked base station initiation setup requests, (exhale, this hair by individual calling or group Bright method mainly considers that the group in cluster is exhaled) when, by wired between PDT arrowbands trunked base station and TD-LTE broadbands trunked base station Interconnection, joint is subjected to physical layer resources distribution;Comprise the following steps:

(1) receiving end (uplink is then PDT arrowbands trunked base station, and downlink transfer is then user terminal) judges signal first It is signaling or data service, if signaling, then distributes narrow band channel transmission signaling, transmission channel distribution terminates;If data Business, then continue executing with step (2);

(2) PDT arrowbands trunked base station (is divided into broadband services, narrow band service, needs broadband to support according to data traffic types Narrow band service) and the priority of called party carry out physical layer resources distribution, carry out broadband, narrow-band transmission channel and tentatively join Close distribution;Its detailed process is:

(2-a) determines type parameter μ corresponding to type of servicej, j ∈ { 1,2,3 }:PDT arrowbands trunked base station presses industry first Service type is classified, and is divided into broadband services, narrow band service and the narrow band service three types for needing broadband to support, juxtaposition three Type parameter is respectively μ1, μ2, μ3, μ1, μ2, μ3Represent that three kinds of different kinds of business need the broadband and narrowband channel distributed respectively The ratio between number (number of sub carrier wave);Wherein μ1>1 (typically in the range of 1 to 1000, the present embodiment μ1=4) corresponding broadband, is represented (transmitting procedure middle width strip channel quantity will be more than narrow band channel, this reality to group service (such as high-definition image, video, big data) It is 4 that a middle width strip channel quantity, which is applied, with narrow band channel ratio of number:1);Correspondingly, μ3<1 (typically in the range of 0.001 to 1, The present embodiment is), represent corresponding arrowband group service (such as common voice or short message) (transmitting procedure middle width strip Channel quantity will be less than narrow band channel quantity, and the present embodiment middle width strip channel quantity is 1 with narrow band channel ratio of number:4);And For the narrow band service for needing broadband to support, μ is set2For between μ1And μ3Between value come the broadband of distribution needed for representing with it is narrow Band channel ratio of number (such as the present embodiment μ2=1 represents that broad-band channel and narrow band channel ratio of number are 1:1);

(2-b) PDT arrowbands trunked base station obtains the set of User Priority:(priority is set known, is represented The relative priority grade of different user in group-calling process) User Priority represents with i, Digital Clustering user is divided into L Priority, L are positive integer, then (the present embodiment takes L=6 to i ∈ { 0,1 ..., L-1 }, then User Priority i can use in the present embodiment Value 0,1 ..., 5, priority arranges from low to high).

(2-c) determines the total number of channels that different priorities i user is distributed using increasing function T (i):(user's is preferential Level is bigger, and the channel number for its distribution in calling procedure is more, i.e., under the same conditions, its communication quality will more have guarantor Barrier.) priority that i represents user is set, if actually available total number of channels is S, then it is i's that increasing function T (i), which is expressed as priority, The total number of channels of user's distribution, i ∈ { 0,1 ..., L-1 }, increasing function T (i) selection principle should meetStrictly less than S, the total number of channels of highest priority user can be made(the present embodiment selection T (i)=R (1+i*a), i ∈ 0, 1 ..., L-1 }, the number of channel that wherein R is distributed by the user of priority 0, a represents the incremental extra channel number of each priority Account for the percentage for the number of channel that priority is distributed by 0 user;L=6 in the present embodiment, to meetLess than S, then The present embodiment can use) (increasing function T (i) represents that priority i is bigger, and the number of channel that user is distributed is more.)

(2-d) is according to type of service parameter μjBroadband and narrow band channel quantity are determined in proportion with increasing function T (i):To be excellent The broad-band channel quantity of user that first level is i distribution isμjRepresent in above-mentioned three classes business Certain business type parameter, be priority be i user distribution narrow band channel quantity be

(3) transmission channel distribution is completed according to actually available broadband, narrow band channel quantity;Specifically include:

(3-a) judges whether broad-band channel quantity is insufficient:If actually available broad-band channel quantity is more than or equal to Then broad-band channel quantity is enough, performs step (3-b);If actually available broad-band channel quantity is less thanThen broadband Channel quantity deficiency, performs step (3-c);

(3-b) judges whether narrow band channel quantity is insufficient:If actually available narrow band channel quantity is less than Then narrow band channel lazy weight, perform step (3-d);If actually available narrow band channel quantity is more than or equal toThen Narrow band channel quantity is enough, and transmission channel distribution terminates;

(3-c) (such a situation is only broadband collection group channel deficiency, then) takes arrowband collection group channel to supply broadband collection group channel (because arrowband cluster coverage is more more extensive than broadband cluster, therefore, believed with arrowband collection group channel to supply broadband cluster During road, the less arrowband collection group channel of the broadband cluster channel number than needed for is selected);Transmission channel distribution terminates;

(3-d) (such a situation is only arrowband collection group channel deficiency, then) takes broadband collection group channel to supply arrowband collection group channel (because arrowband cluster coverage is more more extensive than broadband cluster, therefore, believed with broadband collection group channel to supply arrowband cluster During road, selection cluster channel number more broadband collection group channels in arrowband than needed for, if remaining available bandwidth channel can not be completed Slightly more than scarce narrow band channel supply, then no longer additionally supplied, that is, take single-candidate broad-band channel to supply narrow band channel);Pass Defeated channel distribution terminates.

In group-calling process, the channel that different priority users are distributed is the letter distributed in a upper priority users It is increased on the basis of road.First select priority the total number of channels T (0) for 0 cluster user, such as R in the present embodiment, in width According to type of service parameter μ in band cluster available channeljThe number of channel needed for selection;The user that priority is i is i-1 in priority User select channel on the basis of, incremental channel is selected in available channel, increment is T (i)-T (i-1).

Claims (3)

1. a kind of multi-link group system of wide and narrow strip fusion, it is characterised in that the system includes the broadband collection based on TD-LTE Group base station, PDT arrowbands trunked base station, n digital trunking user terminals, the Digital Clustering user terminal simultaneously there is broadband to connect Interface and narrow-band reception interface are received, the broadband reception interface and narrow-band reception interface of each Digital Clustering user terminal are distinguished simultaneously Pass through wideband digital collection group channel and narrow-band digital collection group channel and the broadband trunked base station based on TD-LTE, PDT arrowbands cluster Base station is connected;Broadband trunked base station, PDT arrowbands trunked base station based on TD-LTE pass through wideband digital collection group channel and arrowband number Word collection group channel is Digital Clustering user terminal co-allocation wideband digital collection simultaneously to Digital Clustering user's transmission signal Group channel and narrow-band digital collection group channel;The co-allocation of the multi-link group system transmission channel of described wide and narrow strip fusion exists New interface is established between broadband trunked base station and PDT arrowbands trunked base station based on TD-LTE, makes wide, the arrowband cluster base Stand wired interconnection, with intercommunication physical layer resources and need the data-signal transmitted;
Establish call:When call subscriber terminal is to PDT arrowbands trunked base station initiation setup requests, PDT arrowbands cluster By wired interconnection between base station and TD-LTE broadbands trunked base station, joint is subjected to physical layer resources distribution;Including following step Suddenly:
(1) receiving end judges that signal is signaling or data service first, if signaling, then distributes narrow band channel transmission signaling, passes Defeated channel distribution terminates;If data service, then step (2) is continued executing with;
(2) PDT arrowbands trunked base station carries out physical layer resources distribution according to the priority of data traffic types and called party, Carry out broadband, the preliminary co-allocation of narrow-band transmission channel;
(3) transmission channel distribution is completed according to actually available broadband, narrow band channel quantity;
Step (2) detailed process is:
(2-a) determines type parameter μ corresponding to type of servicej, j ∈ { 1,2,3 }:PDT arrowbands trunked base station presses type of service first Classified, be divided into broadband services, narrow band service and the narrow band service three types for needing broadband to support, three type ginsengs of juxtaposition Number is respectively μ1, μ2, μ3;μ1, μ2, μ3Represent respectively three kinds of different kinds of business need the broadband and narrowband number of channel distributed it Than;Wherein set μ1>1, μ3<1;μ is set2For between μ1And μ3Between value;
(2-b) PDT arrowbands trunked base station obtains the set of User Priority:User Priority is represented with i, by Digital Clustering user L priority is divided into, L is positive integer, then i ∈ { 0,1 ..., L-1 }, and priority arranges from low to high;
(2-c) determines the total number of channels that different priorities i user is distributed using increasing function T (i):If i represents the excellent of user First level, if actually available total number of channels is S, then increasing function T (i) is expressed as the total number of channels that the user that priority is i distributes, I ∈ { 0,1 ..., L-1 }, increasing function T (i) meetLess than S, the total number of channels of highest priority user is made
(2-d) is according to type of service parameter μjBroadband and narrow band channel quantity are determined in proportion with increasing function T (i):It is for priority I user distribution broad-band channel quantity beJ ∈ { 1,2,3 }, μjRepresent certain industry in above-mentioned three classes business The type parameter of business, the narrow band channel quantity for being user's distribution that priority is i are
2. system as claimed in claim 1, it is characterised in that increasing function T (i) chooses T (i)=R (1+ in the step (2-c) I*a), the number of channel that i ∈ { 0,1 ..., L-1 }, wherein R are distributed by the user of priority 0, a represent that each priority is incremental Extra channel number accounts for the percentage for the number of channel that priority is distributed by 0 user.
3. system as claimed in claim 2, it is characterised in that the step (3) specifically includes:
(3-a) judges whether broad-band channel quantity is insufficient:If actually available broad-band channel quantity is more than or equal toThen Broad-band channel quantity is enough, performs step (3-b);If actually available broad-band channel quantity is less thanThen broadband is believed Road lazy weight, perform step (3-c);
(3-b) judges whether narrow band channel quantity is insufficient:If actually available narrow band channel quantity is less thanThen arrowband Channel quantity deficiency, performs step (3-d);If actually available narrow band channel quantity is more than or equal toThen arrowband is believed Road quantity is enough, and transmission channel distribution terminates;
(3-c) takes arrowband collection group channel to supply broadband collection group channel;Transmission channel distribution terminates;
(3-d) takes broadband collection group channel to supply arrowband collection group channel;Transmission channel distribution terminates.
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