MXPA97004131A - Method and device of macrodiversity of ascending link in a digi mobile radiocommunication system - Google Patents

Abstract

The present invention relates to a digital cellular mobile radiocommunication system comprising a mobile station transmitting an information block and a set of base stations receiving blocks of information corresponding to said block of information transmitted in each base station of said set. This communication system contains an uplink macrodiversity system with devices in each base station to determine a quality measurement that represents the reliability of each respective received information block and a decision device to choose the block of information received with the best quality measurement as a common output information block of said set of bus stations

Description

METHOD AND APPARATUS OF MACRODI ASCENDING LINKED EPSITY IN A DIGITAL MOBILE RADIOCOMMUNICATION SYSTEM TECHNICAL FIELD The present invention relates to macro iversity in a digital mobile radiocommunication system, and especially a method and apparatus for macrod uplink link in such a system, BACKGROUND OF THE INVENTION In mobile cellular communication systems e = > digi ales convenio l s, a =? station rnovil communicates only with a base station d-e at a given time. Without it, and recently, it has been suggested that what is called m.c f-od i verity be used in such a way. This concept means that in the network connection, several stations of The base blocks send the same blocks of information to a mobile station, which combines the blocks sent in a final received block. In the uplink direction, a mobile station transmits a block? of information that is received in vain base stations. The received blocks are transmit to a single node in the terrestrial system, for example a mobile service switching center, where the received blocks are combined in a received end block. These friction1; they increase the confi dence of the received information blocks, since the information has been displaced along several paths, vr > .3. of which you can allocate information less than the other • One drawback of these uplink diversity methods is that the blocks of information received from many base stations must be sent to the mobile service switching center, which reduces the capacity of the terrestrial system. SUMMARY OF THE INVENTION The purpose of the foregoing invention is therefore to provide a method of uplink macroadjustment in a digital cellular radiocommunication system where 1 =? The increase in the terrestrial system is increased by reducing the amount of information that must be transmitted between base stations and the next node of the terrestrial system of said communication system, for example a mobile service switching center. One way to combine blocks of information from several base stations is to use only the information of the "best" block. In such a case, it would be unnecessary to transfer the information from the discarded blocks between the base stations and the mobile service switching center. Accordingly, the present invention is based on the idea that it sees. to transfer all blocks ~ ec ib i two, is suf i > - 1 enl ^ nloda a measurement of > ality for each block and transfer only these quality measurements. The quality measurements received by the mobile service switching center are compared, and the base station from which the best quality measurement was collected is ordered to transfer its information block. BRIEF DESCRIPTION OF THE DRAWINGS The invention, together with objects and additional advantages thereof, can be better understood by referring to the following description together with the drawings n aos, where: FISURA 1 is a block diagram of a part of a digital cellular mobile ion communication system illustrating the concepts of the present invention; FISURA 2 is a diagram that illustrates l a. transferring signals between base stations and a mobile service switching center operating in accordance with the present invention; and FIGURE 3 is a flow diagram illustrating the method of »conformance with the present invention. DESCRIPTION DETAILED DF THE PREFERRED MODALITIES The present invention will now be described with reference to a TDMA ipo digital cellular radiocommunications system. However, the invention is not restricted to such systems, but can also be applied to other digital cellular systems, such as TDMA. In figure 1, a mobile station SM transmits information blocks, which are received in two base stations BS1 and BS2 »The signals received with desulated and decoded according to conventional methods, and the blocks of information BL1 BL2 , respectively, are stored in respective buffers BLJF 1 and BUF 2. Fn a preferred modality, an information block in a frame, which typically corresponds to 100-40 of vo ^ / data. the microprocessor controllers MPC1 and MPC2, respectively, recovering the relevant bits *, in bit recovery lines B to calculate and ervi Q corresponding Q and Q2 quality methods, respectively, of the stored blocks BLI and BL2 . Here, the concept of quality measurement does not necessarily mean only a single value, but may involve a sequence of values representing different aspects of the quality of the respective block received. Examples of suitable quality measurements are the number of b and c in a block containing an error that could be corrected, the number of bytes that contain non-correctable errors, or a combination of them. * Describe in? - >; l ocum to WO - ^ 4/05100, in accordance with which a channel estimate is used to form a quality measurement. The quality measurements Q, Q2 are sent on respective lines 11, 1.2 to the mobile service switching centers MSC, which contain a decision device DEC that receives these signals. The decision device DEC can, for example, comprise a microprocessor. The points below the line 3 Ll and below the line .; DEC device decision input drive that quality measurements can be received from more than two base stations. In fact, in its most general form, the invention involves the reception of quality measurements Ql, 2,.,., ON from a set of corresponding base stations BSl, BS2, ..., BSN. The decision device DEC determines the received quality mea- sure and sends an M message to the microprocessor controller in the base station corresponding to BS1 or BS2 in the corresponding line Ll or L2. The microprocessor controller receiving this message in a line C gives instructions to its buffer memory to send its block (BLI or BL2) to the mobile service switching center MSC, in l a. corresponding output line, L1 or L2 > . The block received by the mobile service center of MSC services is considered c > »FO" - *! Common output block p-sra all esl = .c base ions in the set The above procedure is illustrated further in Figure 2. Here, quality measurements l and 02 are received by the center mobile switching service MSC from the base stations BS1 and BS2 respectively, the decision device in the mobile service switching center MSC determines that G.} 2 is the best measurement, which implies that block Bl.2 is the most reliable block For> gs? gi? entg>, the mobile service switching center 0 MSC sends an M3 message to the base station BS2, in e] c >At the microprocessor copier MPC2 instructs the PUF buffer to send the block? to the mobile service switching center *. MSC, which in turn sends the BL2 block on 3rd line L3 to the public network of 5 connected PSTN telephones (see figure 1) as a common output from the base stations BS1, BS2 In the above description, it has been considered that the lines Ll, L2 are used for signaling (Q1, Q2, M), as well as for information transfer (BL2, BL2). However, in practice, separate lines may exist to signal and transfer information. Fig. 3 is a flow chart illustrating the method described above. The routine embeds in step 300. In step 31, the measurements 01, 02, ..., QN of the blocks of "" "- information re i i 'ds are calculated in each base station BSl, BS2 , •••> BSN in the set In step 320, the set of quality measurements Ql, Q2,, QN is sent to the decision device DEC In step 430, the decision device DEC determines the best measurement Q. In step 340, the base station corresponding to the block with the best Q receives the instruction to send its block as common output from the whole set of base stations Finally, the routine ends in step 35 This routine is based on the block of information transmitted to and from the mobile station S and received by the base stations in the set. In the described mode, the decision device has been considered to be DEC is nfaici in a mobile service switching terminal, however, this is not necessarily the case, since the DEC decision device does not actually process any block of received information, it only receives quality measurements, determines the best measurement and gives instructions to corresponding base stations to send its block. Accordingly, the decision device DEC can be physically separated from the mobile service switching center MSC. However, the blocks of information actually transferred from the; Base stations BSl, BS2 will be sent to the mobile switching center to be routed. MSC. and In the above description, it has also been considered that only one block of information is chosen from a set of information blocks received. However, within the scope of the present invention is the formation (in element DEC in Figure 1, for example) of a combination of the best blocks received (in terms of quality measurement) as a common output from a set of base stations. This will reduce even more the amount of signal 1 i r i i n, since not all; received blocks > .n n to be transferred 3.}. mobile service switching comm. For example, > ? the 3 best received blocks are transferred to the mobile service switching center, a combined block can be formed by matching each bit in this block to the value of the majority of the 3 b? t? o? > transferred. Furthermore, in this specification, the present invention has been described with reference to a TDMA system. However, as noted above, the invention can also be applied to a CDMA system. It will be observed on the part of the experts in the matter that varies; Changes and modifications can be made to the present invention without departing from the spirit or the spirit of the invention, in accordance with what is stated in the scripts.

Claims (5)

1. CLAIMS 1. An uplink macroadvice method in a digital cellular mobile radiocommunications system, comprising the steps of transmitting a block of information to 5 from a mobile station and receive blocks of information corresponding to d? > ho block of information t to smitida in cad-t ha station - ** »of a predetermined set of parking» of UJ ^ P, said method Ca i -je. I will say it by or μ .-. o- _; d i < ~ onale. from; ("J to determine, in the case of quality, and to represent the said condition, and to represent the quality of the information block] We would like to see what we can do in order to improve the quality of information with a block of information from the common output of 5 of the set of base stations. The method of 1-t rei indi ion l, face and raised by the adi ciña pa iles to: eci.'iar the measurement of ali ad from each e- = ta &g. In base to a device and to determine the best quality measure in said slide and decide and order 1 = * is the basic action that corresponds to the best measurement of quality "? - in i block d-? information received as said information block from common ali, ^ 3 An ft >? t > > > > i laugh ni -s > '' >'' • '.. e-'r-iity and link 3 e epclt rn rn a digital cellular mobile radiocommunications system, comprising the p These methods are used to transmit an infrmation block from a mobile station and receive blocks and information corresponding to said information block 5 tr.n? init left in each base station of a predetermined set of base station, said method s ea r-ae ten -: by 1 os des des et ii. t ii - < r, on each base in said conjunction, un- 'dir 3 ófi i a íds'-i that represents- < 'A or flexibility i dt. »Da l" knjLif and information cibi or respegt; ti o; i.omb i na > "tro ues' .le infijripii ion re > . ? h? -5 i.w ¡? In? -n 1 ja lllf- Jul'is l? Iecll '. IntlH * li i í 1 i d "d efi a t > 1 oi i i i i i i i i i i i i i i i 'i' i'i'i'i'i'i'i'i'll'i'i'i'i'i'i'i'i'i'i'i'i'i'i'i'i'i'i'i'i'i'i'i'i'i'i'i'i'i'i'i'i'i'i'i'i. > *., 5 l. A system of ma roo i ve s i. Ascending Liability in > In a digital cellular m-fl system, it comprises a mobile station that transitions a block or informs a basic set of information blocks that correspond to said block of information. ? information transmitted) in the base station in said > -onjun, or said epigraph is c rac erized by: isositive iMPCl, ^ C) in each base station? FS_, B "'i.licho piunt for et rmina a measurement of» al? d3d iQl, 02) that represents 1 => confi abi lity of each 5 bloaue -t informs received ion res ctive »'BLI, EL) 1 l decision device 'DE to choose the block of information received < BL1, Bl.2 > with the best quality measurement as a common output information block of each set of base stations (BS1, BS2). 5 5. The diversity system of the rei indication 4, characterized because -the said decision device íDFC) is found > orter tado ca a stacion de bí ^ < BS1, PS) in said set to r ^ .ibir icha :; Edition is quality, ideal for the best edition of tid-au and order - 1 -t 10 .ta u > r? ?. | or base > I > > ~ ^ > What is the best m die? ? > e ca i -or qu e on your information block r r ibido •. orno icho p loque d information, -if. --jl ul3 conn'in. E3 system of iv rsi a} ~ rei indi aci n r ,, ac acted because ich d 1? -O = > 1 t, 3 yo de ci i DEC s 15 pr pnrr i on- > »A mobile hub of c riiii tßc 1 ón de s i j ÍMSC). 7, A flashlight with an uplink link in a digital cellular communication system, comprising a digital illustration transmitting a digital block. 20 information on a set of base stations receiving blocks of information ue c o? Respect to the block and the fo rm a nsmi nd a nd base p a rt ion in di cient ceit-i nn, and the d? v-i rity system is reacted by; di spo-: > . t i vos ÍMFC1, MFC2 in each base station ESI, "" - rr "'- i' go h, ~ eifi inri I-i". f) = sr- < Etermi nar a? (quality liP &01 01, 02) representing the conf iab 11 iclad d «each respective received information block (BLI, B12> 5 device (DEC) to combine some received information blocks (BLI, BL2) which have the best quality measurements in a common output information block of said joint of base stations (BS1, BS2).