CN101192870B - A relay system for mobile communication - Google Patents
A relay system for mobile communication Download PDFInfo
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- CN101192870B CN101192870B CN2006101146580A CN200610114658A CN101192870B CN 101192870 B CN101192870 B CN 101192870B CN 2006101146580 A CN2006101146580 A CN 2006101146580A CN 200610114658 A CN200610114658 A CN 200610114658A CN 101192870 B CN101192870 B CN 101192870B
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Abstract
The invention discloses a relay system for mobile communication, which comprises a plurality of base stations used for directly communicating with a user terminal or communicating with the user terminal through a relay station, a plurality of digital relay stations used for realizing the digital relay between the base stations and the user terminal and applying the analog processing or non-processing to the control signal and applying the digital processing to the data signal. The digital relay station of the invention respectively applies different modes of processing to the control signal and the data signal and only minimum modification of various devices of the present network needs to be carried out for the system, so the relay system not only has good relay performance, but also has strong compatibility and delivers low scheme realization cost.
Description
Technical field
The present invention relates to moving communicating field, relate in particular to a kind of relay system of the analog-and digital-mobile communication that combines.
Background technology
Honeycomb is all adopted in modern mobile communication networking, each radio node or base station have the complete signal processing function from the radio frequency to the base band, for the allocation of space once more of carrying out special covering and carrying out capacity, also adopted repeater (Repeater), the repeater is actually a kind of equipment that includes only radio frequency processing.
Honeycomb can come the increase capacity by methods such as cell splittings, but the problem of bringing is communication repeating efficient and decreased performance.The repeater can cause that then uplink capacity reduces, thereby and might become new signal interference source and influence performance of the entire network.
Based on above-mentioned situation, digital junction has been subjected to paying close attention to widely, and IEEE 802.16 and European research and development plan WiNNER carry out standardization or research to this.Different with traditional repeater is, digital junction relates to radio frequency and Base-Band Processing, in order to realize digital junction, base station side also will have corresponding improvement, it specifically is the transmitting-receiving of introducing improved frame structure on the physical layer and don't influencing the user terminal of directly traditional and base station communication, MAC (Media Access Control, the medium access control) layer carries out the federated resource scheduling for digital junction station and user terminal, needs the handoff functionality of enhancing owing to introducing digital relay station on the radio resource.
The current digital junction of studying or proposing also has the improved place of following needs:
(1) repeater and digital junction station best of breed application need are inquired into.The repeater does not have the processing of delay (not comprising that radio frequency processing postpones) for all signals that comprise control signal and data-signal, digital processing is generally carried out to all signals in the digital junction station---regeneration and storage forward signal, although signal quality improves, cost is to postpone to have influence on QoS (Quality ofService, service quality), also have influence on the availability of frequency spectrum.
(2) best mode that need find control signal and data-signal to handle.Present a kind of mode is to adopt digital form to handle all, and another mode is a digital junction station process data signal, and control signal is handled by the base station.
(3) trunking method that proposes at present often relates to multistage relaying.Although multistage relaying has superiority on expansion covers and can adopt collaborative MIMO (Multiple-Input Multiple-Out-put, many inputs/many outputs) and distributed MIMO, but the routing management that brings is complicated in addition can't compatible tradition directly and the problem of the user terminal of base station communication.Therefore objectively the relaying number of plies is difficult for too many.
In summary, the relay system of existing mobile communication obviously exists inconvenience and defective, so be necessary to be improved on reality is used.
Summary of the invention
The object of the present invention is to provide a kind of relay system of mobile communication, this relay system not only has good relaying performance, and compatible strong, and scheme realizes that cost is low.
To achieve these goals, the invention provides a kind of relay system of mobile communication, comprising:
Several base stations is used for directly and user terminal communication or by digital junction station and user terminal communication;
The number of digital relay station is used for realizing digital junction between described base station and user terminal, and control signal is adopted simulation process or do not handle, and data-signal is adopted digital processing;
Wherein, simulation process is adopted to control signal in described digital junction station, is meant that the digital junction station directly handles at intermediate frequency the control signal of base station and/or user terminal; Digital processing is adopted to data-signal in described digital junction station, is meant that the digital junction station regenerates to the digital signal of base station and/or user terminal and store forwarding.
According to system of the present invention, described user terminal to base station adopts the one-level digital junction, and each described digital junction station only belongs to a base station.
According to system of the present invention, be provided with some repeaters in the overlay area of described base station, described base station and the equivalence of some repeaters are the performance of a base station, and described repeater and digital junction station combination in any.
According to system of the present invention, the relay data resource items is introduced in the data field of the physical frame structure of described base station.
According to system of the present invention, described control signal comprises that the base station arrives the downgoing control signal of user terminal and the uplink control signal of user terminal to base station, and realize synchronously by analyzing described control signal at described digital junction station.
According to system of the present invention, reference signal in the downgoing control signal at the downgoing control signal of described base station and described digital junction station is identical with the form of broadcast singal, but the beared information in the downgoing control signal at the downgoing control signal of base station and digital junction station is different: the beared information of base station comprises the information at subordinate digital junction station of this base station and the identifier at each digital junction station; The beared information at digital junction station comprises the identifier at digital junction station.
According to system of the present invention, reference signal in the downgoing control signal at described base station and digital junction station and broadcast singal adopt the alternately emission of orthogonal manner time-division, and described signal of base station launching opportunity is greater than the signal transmitter meeting at digital junction station.
According to system of the present invention, described control signal is if cover the whole service scope, and described digital junction station is selected not handle; Described control signal be if can not cover the whole service scope or the control signal covering power is bad, or avoids the user terminal access power excessive, and simulation process is selected at described digital junction station.
According to system of the present invention, described digital junction station is adopted uplink control signal and is not handled, and is meant that the digital junction station do not carry out any processing of signal in being amplified in that comprise to the control signal of base station and/or user terminal.
According to system of the present invention, described user terminal is not only supported the switching between base station and the base station, also supports the switching between the affiliated digital junction station of switching and same base station between base station and the digital junction station; For the switching between the digital junction station under the different base station, user terminal is at first finished the switching between base station and the base station, finishes the switching between base station and the affiliated digital junction station again.
According to system of the present invention, described digital junction station comprises stationary digital relay station and mobile digital relay station, and descending control resource is reserved for the stationary digital relay station in described base station, perhaps obtains descending control resource after the success of stationary digital relay station network registry; Obtain descending control resource after the described mobile digital relay station network registry success.
According to system of the present invention, described registration is exactly that the digital junction station at first obtains base station system information and obtains down-going synchronous by base station reference and broadcast singal, obtains uplink synchronous then, and the process of registering in the base station.
According to system of the present invention, the affiliated user terminal of described mobile digital relay station has essentially identical switching demand, when switching, the whole affiliated user terminal information of this mobile digital relay station is known in the base station, and the measurement of all or part of affiliated user terminal is merged to realize whole the switching.
Digital junction of the present invention station is passed through control signal and the processing in different ways of data-signal difference, and system only needs each equipment of existing network is done the change of minimum degree, thereby this relay system not only has good relaying performance, and compatible strong, and scheme realizes that cost is low.
Description of drawings
Fig. 1 is the repeater and the digital junction station mixed networking figure of first embodiment of the invention;
Fig. 2 is the networking diagram of the employing mobile digital relay station of second embodiment of the invention;
Fig. 3 is the schematic diagram of downgoing control signal radiation pattern of the present invention;
Fig. 4 is the schematic diagram of four kinds of physical frame structures of the present invention;
Fig. 5 is the switching schematic diagram of relay system of the present invention;
Fig. 6 is the schematic diagram that the integral body of mobile digital relay station of the present invention is switched.
Embodiment
In order to make purpose of the present invention, technical scheme and advantage clearer,, the present invention is further elaborated below in conjunction with drawings and Examples.Should be appreciated that specific embodiment described herein only in order to explanation the present invention, and be not used in qualification the present invention.
Basic thought of the present invention is, a kind of relay system of mobile communication is provided, adopt digital junction to stand between base station and the user terminal and realizes digital junction, and the digital junction station adopts simulation process to control signal or do not handle, and data-signal is adopted digital processing.The present invention not only has good relaying performance with assurance, and compatible strong, and scheme realizes that cost is low.
First embodiment of relay system of the present invention comprises base station 101, repeater 102 and 103, digital junction station 104 as shown in Figure 1.Described base station 101 is used for directly and user terminal communication or by digital junction station and user terminal communication, and base station 101 has overlay area 105.Because some spatial fadings and building, base station 101 in the overlay area 106 and overlay area 107 cover undesirable, so adopted repeater 102 and 103 respectively in two zones, to play the effect that signal strengthens in the transmission course.In this relay system, it can equivalence be the performance of a base station still that a plurality of repeaters are adopted in the base station, therefore be not considered to adopt the one-level digital junction, particularly importantly the repeater can transparent transmission for signal, can not bring any influence to base station and user terminal, therefore repeater and digital junction station can combination in any, generally more close base stations, repeater.Realized a virtual base station overlay area 105 by base station 101 and repeater 102 and 103 among the embodiment one.For the overlay area of extended base station 101 and further improve the cell edge throughput, employing is fixed or mobile digital relay station 104 is realized digital junction between base station 101 and user terminal, the overlay area 108 of expansion has been realized at this digital junction station 104, and the gain of digital junction station mainly has benefited from physical-layer techniques and the link-layer technologies that more complicated can be adopted in the digital junction station.
A large amount of digital junction stations can be set in the relay system of the present invention, but user terminal to base station preferably adopts the one-level digital junction, and each digital junction station only belongs to a base station, and reason is the mode of simple and compatible legacy user terminals of the routing management of one-level digital junction and the direct communication in base station.
Digital junction of the present invention station is adopted simulation process to control signal or is not handled, and data-signal is adopted digital processing.When control signal can cover under whole service scope (the comprising the digital junction scope of business) condition, then the digital junction station is selected not handle; If can not cover the whole service scope or the control signal covering power is bad, or avoid the user terminal access power excessive when control signal, then simulation process is selected at the digital junction station.What is called is not handled, and is meant that the digital junction station do not carry out any any processing of signal in being amplified in that comprise to the control signal of base station and/or user terminal.So-called simulation process, be meant that the digital junction station do not carry out digital processing to the control signal of base station and/or user terminal but directly handle at intermediate frequency, select simulation process but not digital processing will at utmost guarantee to introduce behind the digital relay station transparent for the user terminal working method.So-called digital processing is meant that the digital junction station regenerates to the data-signal of base station and/or user terminal and store forwarding.
Control signal of the present invention comprises the downgoing control signal of base station and user terminal and the uplink control signal of base station and user terminal, and realize synchronously by the analysis and Control signal at described digital junction station.The downgoing control signal of described base station comprises reference signal, broadcast singal, scheduling of resource signal etc., and the condition of a supposition of the present invention is that the digital junction station can obtain by the downgoing control signal of analyzing the base station synchronously; The uplink control signal of described base station comprises accidental access signal etc.Base station and digital junction station all need transmitting downstream reference signal and broadcast singal, and purpose is in order to discern base station and digital junction station, also to provide reference for switching.Reference signal in the downgoing control signal at base station and digital junction station is identical with the form of broadcast singal, but the beared information in the downgoing control signal at base station and digital junction station is different: the beared information of base station comprises the information at subordinate digital junction station of this base station and the identifier at each digital junction station; The beared information at digital junction station comprises the identifier at digital junction station.In order to guarantee transparent for user terminal to greatest extent, the downlink reference signal at base station and digital junction station and broadcast singal adopt the alternately emission of orthogonal manner time-division, importance and the performance of handoffs of considering the base station beared information mainly rely on the base station reference signal, therefore can design the base station chance greater than digital junction station launching opportunity.
With existing digital junction station to all signals all carry out digital processing different be that digital junction of the present invention station is by in different ways the processing respectively of control signal and data-signal, thereby guaranteed good relaying performance, and compatible strong; And native system only needs each equipment in the existing network (for example base station, digital junction station, user terminal etc.) is done the change of minimum degree, thereby scheme realizes that cost is low.
The second embodiment of the present invention as shown in Figure 2, base station 201 and base station 202 have overlay area 206 and 207, in order to realize mobility, these two overlay area parts are intersected.And be provided with mobile digital relay station 203 and finish certain overlay area 204, the label 205 among Fig. 2 represent user terminal integral body in the overlay area 204 of mobile digital relay station 203 from the overlay area 206 processes that move to overlay area 207.If do not adopt the mobile digital relay station, signal quality can be subjected to obviously influence and unstable in the general mobile object (for example automobile), if each user terminal all faces serious Doppler's influence and has influence on throughput in the mobile digital relay station in addition, adopted the mobile digital relay station can adopt complicated technology and base station communication to offset Doppler's influence, mobile digital relay station and user terminal may be considered as not having Doppler to influence.
In order to finish the switching behind the various introducing digital junctions, at first need to discern the residing overlay area of user terminal, what the method for identification communication overlay area was the most basic is to design downgoing control signal (particularly reference signal).Fig. 3 has illustrated the radiation pattern of downgoing control signal (particularly reference signal), downgoing control signal adopts the time-division working method as can be seen from Figure 3,301,302 and 303 is respectively the downgoing control signal radiation pattern at the affiliated second digital junction station in the first digital junction station and base station under base station, the base station, and three downgoing control signals are quadratures.User terminal obtains following information from the base station reference signal: whether the base station has the digital junction station of subordinate, the identifier at each digital junction station.User terminal obtains following information from digital junction station reference signal: the overlay area that whether is in some digital junctions station.
The prerequisite of carrying out descending control resource allocation is the number at digital junction station under the base station will be known, and each digital junction station will be registered at network side.Whether a base station has the stationary digital relay station to learn in advance, therefore can adopt the method for configuration to reserve descending control resource in the base station, for the stationary digital relay station, obtain descending control resource after also can adopting stationary digital relay station network registry success, obtain descending control resource after can only adopting the network registry success for the mobile digital relay station.Described registration is exactly that the digital junction station at first obtains base station system information and obtains down-going synchronous by base station reference and broadcast singal, obtains uplink synchronous then, and the process of registering in the base station.Network registration process can adopt directly conventional and base station communication user terminal logon mode carries out.Descending control resource allocation can be transparent fully for user terminal, and user terminal needs only processing control signals in a conventional manner, and different is to need the identification control signal to belong to base station or digital junction station, and then prepare for switching.
Fig. 4 with TDD (Time Division Duplex, time division multiplexing) for example from the base station 401, digital junction station 402, directly and the user terminal 403 of base station communication and the physical frame structure of seeing by the user terminal 404 of digital junction and base station communication.The resource at user terminal and affiliated digital junction station under the MAC layer-management of base station, see that from Fig. 4 the digital junction station adopts analog form not have time delay processing for descending and uplink control signal, if the transfer control signal ability in base station own is relatively good certainly, digital high-frequency amplification station also can be selected not carry out handling.The variation of the data field maximum of the physical frame structure of base station is to have introduced the relay data resource items.For descending employing base station to the digital junction station again to the processing mode of delivering in relays of user terminal, up employing user terminal to the digital junction station again to the processing mode of delivering in relays of base station.For up, user terminal and affiliated digital junction station link and digital junction station and affiliated base station link can only have simultaneously one in running order, descending also similar.
Fig. 5 is the switching schematic diagram of relay system of the present invention, switching 506 is the switchings between digital junction station 503 and the base station 501, switching 507 is the switchings between digital junction station 504 and the base station 505, switching 508 then is switching between base station 501 and the base station 505, does not participate in switching as for 502 of repeaters.For the switching between digital junction station and the base station 506 and 507, because the downlink reference signal of digital junction station and base station is identical with broadcast singal, above-mentioned new switch mode can not introduced new problem for measuring and reporting to the measurement of base station, and sees that from base station side the mutual switching between the digital junction station under mutual switching between base station and the digital junction station and the same base station can regard the switching between a kind of inside of base station sector as.Switching 508 between two base stations 501 and 505 is identical with usual manner.The present invention is for the switching between the digital junction station under the different base station, it is the switching between digital junction station 503 and 504, at first consider to adopt switch 508 and switch to the another one base station, adopt then and switch 506 or 507 switchings of finishing between base station and the digital junction station from a base station.Adopt the reason of said method to be because base station reference signal chance is more with reference to Fig. 3, aforesaid way can guarantee better relay capabilities under high-speed mobile.
For mobile digital relaying (as vehicle-mounted body or mobile network's) situation, can consider to adopt the whole mode of switching to improve with reference to figure 6 and switch 508 performance between the base station.The switching demand that basically identical is all arranged owing to all user terminals in the mobile vehicle, therefore finish switch between the base station in, all user terminals 601,602 and 603 under the mobile digital relay station are known in base station 604, therefore base station 604 can merge the measurement of all or part user terminal under the mobile digital relay station 601,602 and 603, to realize whole switching the between the reliable base station.
The principle of the invention is not only applicable to TDD, also be applicable to FDD (Frequency Division Duplex, frequency division multiplexing) system, the principle of the invention is applicable to and comprises FDMA (Frequency Division MultipleAccess, frequency division multiple access), TDMA (Time Division Multiple Access, time division multiple access), OFDMA (Orthogonal Frequency Division Multiple Access, OFDM) and quadrature mobile communication system and wireless access communication system such as single carrier, the part principle also is suitable for so nonopiate mobile communication system and the wireless access communication system of CDMA (CodeDivision Multiple Access, code division multiple access).
Claims (13)
1. the relay system of a mobile communication is characterized in that, comprising:
Several base stations is used for directly and user terminal communication or by digital junction station and user terminal communication;
The number of digital relay station is used for realizing digital junction between described base station and user terminal, and control signal is adopted simulation process or do not handle, and data-signal is adopted digital processing;
Wherein, simulation process is adopted to control signal in described digital junction station, is meant that the digital junction station directly handles at intermediate frequency the control signal of base station and/or user terminal; Digital processing is adopted to data-signal in described digital junction station, is meant that the digital junction station regenerates to the digital signal of base station and/or user terminal and store forwarding.
2. system according to claim 1 is characterized in that, described user terminal to base station adopts the one-level digital junction, and each described digital junction station only belongs to a base station.
3. system according to claim 1 is characterized in that, is provided with some repeaters in the overlay area of described base station, and described base station and the equivalence of some repeaters are the performance of a base station, and described repeater and digital junction station combination in any.
4. system according to claim 1 is characterized in that, the relay data resource items is introduced in the data field of the physical frame structure of described base station.
5. system according to claim 1, it is characterized in that, described control signal comprises that the base station arrives the downgoing control signal of user terminal and the uplink control signal of user terminal to base station, and realize synchronously by analyzing described control signal at described digital junction station.
6. system according to claim 5, it is characterized in that, reference signal in the downgoing control signal at the downgoing control signal of described base station and described digital junction station is identical with the form of broadcast singal, but the beared information in the downgoing control signal at the downgoing control signal of base station and digital junction station is different: the beared information of base station comprises the information at subordinate digital junction station of this base station and the identifier at each digital junction station; The beared information at digital junction station comprises the identifier at digital junction station.
7. system according to claim 6, it is characterized in that, reference signal in the downgoing control signal at described base station and digital junction station and broadcast singal adopt the alternately emission of orthogonal manner time-division, and described signal of base station launching opportunity is greater than the signal transmitter meeting at digital junction station.
8. according to each described system of claim 1～7, it is characterized in that described control signal is if cover the whole service scope, described digital junction station is selected not handle; Described control signal be if can not cover the whole service scope or the control signal covering power is bad, or avoids the user terminal access power excessive, and simulation process is selected at described digital junction station.
9. system according to claim 8 is characterized in that, described digital junction station is adopted uplink control signal and do not handled, and is meant that the digital junction station do not carry out any processing of signal in being amplified in that comprise to the control signal of base station and/or user terminal.
10. according to each described system of claim 1～7, it is characterized in that described user terminal is not only supported the switching between base station and the base station, also support the switching between the affiliated digital junction station of switching and same base station between base station and the digital junction station; For the switching between the digital junction station under the different base station, user terminal is at first finished the switching between base station and the base station, finishes the switching between base station and the affiliated digital junction station again.
11. according to each described system of claim 1～7, it is characterized in that, described digital junction station comprises stationary digital relay station and mobile digital relay station, descending control resource is reserved for the stationary digital relay station in described base station, perhaps obtains descending control resource after the success of stationary digital relay station network registry; Obtain descending control resource after the described mobile digital relay station network registry success.
12. system according to claim 11, it is characterized in that, described registration is exactly that the digital junction station at first obtains base station system information and obtains down-going synchronous by base station reference and broadcast singal, obtains uplink synchronous then, and the process of registering in the base station.
13. system according to claim 11, it is characterized in that, the affiliated user terminal of described mobile digital relay station has essentially identical switching demand, when switching, the whole affiliated user terminal information of this mobile digital relay station is known in the base station, and the measurement of all or part of affiliated user terminal is merged to realize whole the switching.
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| CN2006101146580A CN101192870B (en) | 2006-11-20 | 2006-11-20 | A relay system for mobile communication |
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| CN2006101146580A CN101192870B (en) | 2006-11-20 | 2006-11-20 | A relay system for mobile communication |
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| CN101192870B true CN101192870B (en) | 2011-08-24 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CA2859980C (en) * | 2008-12-26 | 2016-04-12 | Sharp Kabushiki Kaisha | Base station device, mobile station device, communication system, and communication method |
| US8565184B2 (en) * | 2009-02-20 | 2013-10-22 | Lg Electronics Inc. | Method for allocating reference signals of a backhaul link in a relay communication system, and method and apparatus for transmitting/receiving data using same |
| CN101932041B (en) * | 2009-06-19 | 2014-08-13 | 中兴通讯股份有限公司 | Method and device for maintaining relay node connection |
| CN101938775B (en) * | 2009-06-29 | 2017-07-18 | 宏达国际电子股份有限公司 | Method for handling mobility of mobile device and related communication device |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1109332A2 (en) * | 1999-12-13 | 2001-06-20 | Andrew AG | A digital repeater |
| CN1437828A (en) * | 2000-06-19 | 2003-08-20 | 舍尔科姆公司 | RF base station data repeater |
| CN1442961A (en) * | 2002-03-01 | 2003-09-17 | 株式会社Ntt都科摩 | Multi jump connection radio communication system and source station, srunk station, destination station and control signal |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1109332A2 (en) * | 1999-12-13 | 2001-06-20 | Andrew AG | A digital repeater |
| CN1437828A (en) * | 2000-06-19 | 2003-08-20 | 舍尔科姆公司 | RF base station data repeater |
| CN1442961A (en) * | 2002-03-01 | 2003-09-17 | 株式会社Ntt都科摩 | Multi jump connection radio communication system and source station, srunk station, destination station and control signal |
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