WO2002015436A2 - Procede d'utilisation d'une topologie en anneau dans des voies de communication reliant des tetes de radio en cascade - Google Patents

Procede d'utilisation d'une topologie en anneau dans des voies de communication reliant des tetes de radio en cascade Download PDF

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Publication number
WO2002015436A2
WO2002015436A2 PCT/US2001/023527 US0123527W WO0215436A2 WO 2002015436 A2 WO2002015436 A2 WO 2002015436A2 US 0123527 W US0123527 W US 0123527W WO 0215436 A2 WO0215436 A2 WO 0215436A2
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WIPO (PCT)
Prior art keywords
data
segment
radio
interface
link frame
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PCT/US2001/023527
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English (en)
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WO2002015436A3 (fr
Inventor
Ossi Ilari Grohn
Jeffrey Douglas Seifert
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Telefonaktiebolaget L.M. Ericsson
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Application filed by Telefonaktiebolaget L.M. Ericsson filed Critical Telefonaktiebolaget L.M. Ericsson
Priority to AU2001280808A priority Critical patent/AU2001280808A1/en
Publication of WO2002015436A2 publication Critical patent/WO2002015436A2/fr
Publication of WO2002015436A3 publication Critical patent/WO2002015436A3/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/24—Radio transmission systems, i.e. using radiation field for communication between two or more posts
    • H04B7/26—Radio transmission systems, i.e. using radiation field for communication between two or more posts at least one of which is mobile
    • H04B7/2643—Radio transmission systems, i.e. using radiation field for communication between two or more posts at least one of which is mobile using time-division multiple access [TDMA]
    • H04B7/2656—Radio transmission systems, i.e. using radiation field for communication between two or more posts at least one of which is mobile using time-division multiple access [TDMA] for structure of frame, burst

Definitions

  • the present invention relates generally to base stations for mobile communications networks and, particularly, to a ring topology architecture and protocol for connecting a plurality of radio heads to a common control radio interface.
  • LWTS localized wireless telephone systems
  • a plurality of radio heads containing a transmitter and receiver are positioned throughout a building to provide radio coverage for mobile terminals within the building. These radio heads are connected by a control radio interface (CRI) to a mobile switching center (MSC) in a public land mobile network (PLMN).
  • the MSC provides connection to the public switched telephone network (PSTN) to allow users in the localized wireless telephone system to communicate with users within the PSTN as well as other users of the PLMN.
  • PSTN public switched telephone network
  • each radio head looks and behaves like a separate group of transceivers (generally four transceivers per radio head).
  • the radio heads of a LWTS have been connected to the CRI using a variety of interconnection topologies.
  • One such interconnection topology is via T1 or E1 links in a "hub and spoke” or “star” configuration. In this configuration the CRI connects by a direct link to each radio head. This configuration is described in U.S. Patent No. 5,887,267 to Fugaro.
  • Another interconnection topology is a "cascade” or "daisy chain” configuration. In this configuration the radio heads are connected to one another and to the CRI in a serial fashion.
  • This cascaded data communications is described in pending patent application 09/337,448, entitled “Systems and Methods for Communicating Messages Among Cascaded Devices by Bit Shifting,” assigned to the assignee of the present invention.
  • a base station using this cascaded architecture is the 1900 MHz RBS PicoTM Base Station manufactured by Ericsson, Inc.
  • a primary application of the PicoTM Base Station is to establish wireless communications indoors, through the use of low power cellular transmissions that cover limited geographic areas, often referred to as microcells or picocells.
  • the CRI communicates with the radio heads by sending and receiving T1 or E1 frames, referred to herein as data link frames.
  • the data in the data link frames is organized into groups of six time slots, with one group allocated to each radio head.
  • each radio head extracts data allocated to it from the left-most group of six time slots in the data link frame.
  • the radio head then shifts the data in the data link frame one group (6 time slots) to the left before sending it down link to the next cascaded radio head.
  • This process places the data for the next radio head in the leftmost group of six time slots.
  • the next radio head in the cascade repeats this operation - retrieving data from the left-most six time slots, shifting the remaining data in the data link frame to the left by six time slots, and passing the data link frame down the line to the next radio head.
  • each radio head shifts the data in the data link frame to the right by six time slots, inserts its transmit data into the left-most six time slots, and sends the data link frame in the uplink direction to the next radio head in the cascade.
  • the next radio head in the uplink direction repeats this process, shifting data in the data link frame to the right and inserting its data in the left-most group.
  • the final radio head in the uplink chain (which is the first radio head in the downlink chain) transmits the data link frame to the CRI.
  • receive data i.e., data transferred from the CRI to the radio heads
  • transmit data i.e., data transferred from the radio heads to the CRI
  • the data link frame is thus initially largely empty, and is progressively filled with valid data at each radio head.
  • T1 or E1 link between the radio heads and the CRI. Empty groups of six time slots are successfully shifted into (downlink side) or out of (uplink side) the data link frame. Additionally, a full (bi-directional) T1 or E1 is needed between each cascaded radio head, and two T1/E1 interface circuits are required in each radio head.
  • the present invention relates to a mobile communication network comprising a control radio interface (CRI) and a plurality of radio heads connected in a loop configuration with the CRI.
  • Data is communicated between the CRI and the radio heads in data link frames, each data link frame comprising a plurality of segments corresponding in number to the plurality of radio heads.
  • Each radio head comprises an interface having a data extraction circuit to extract receive data from a first segment in the data link frame and a data insertion circuit to insert transmit data into the first segment or into a second segment in the data link frame.
  • the communication network comprises a control radio interface (CRI) and a plurality of radio heads pairs, with one member of each pair connected together with the CRI to form a first loop and the other member of each pair connected together with the CRI to form a second loop.
  • the first and second loops have opposite interconnection order and data is communicated between the CRI and the radio head pairs independently in each loop in data link frames.
  • the mobile communication network comprises a control radio interface (CRI) and a plurality of radio heads, each containing a primary data interface and a secondary data interface.
  • CRI control radio interface
  • a first communication loop connects the CRI together with the radio heads and a second communication loop connects the CRI together with the radio heads in the opposite order from said first communication loop.
  • Data is communicated between the CRI and the radio heads independently in each loop in data link frames.
  • the plurality of radio heads is divided into a first set and a second set.
  • the first communication loop connects the input of the primary data interface and the output of the secondary data interface at each radio head in the first set, and the input of the secondary data interface and the output of the primary data interface at each radio head in the second set.
  • the second communication loop connects the input of the primary data interface and the output of the secondary data interface at each radio head in the second set, and the input of the secondary data interface and the output of the primary data interface at each radio head in the first set.
  • Each data link frame comprises a plurality of segments corresponding in number to half of the radio heads.
  • receive data is extracted from a first segment in the data link frame and transmit data is inserted into the first segment or into a second segment in the data link frame, and at the secondary data interface of each radio head, the data link frame is relayed without modification.
  • the mobile communication network comprises a control radio interface (CRI) and a plurality of radio heads, each containing a primary data interface and a secondary data interface.
  • CRI control radio interface
  • a first communication loop connects the CRI together with the radio heads and a second communication loop connects the CRI together with the radio heads in the opposite order from the first communication loop.
  • Data is communicated between the CRI and the radio heads independently in each loop in data link frames.
  • Each data link frame comprises a plurality of segments corresponding in number to the plurality of radio heads.
  • the input of the primary data interface and the output of the secondary data interface are connected to the first communication loop, and the input of the secondary data interface and the output of the primary data interface are connected to the second communication loop.
  • the present invention also provides a method for communicating between a control radio interface (CRI) and a plurality of radio heads in a wireless communication system.
  • the method comprises connecting the radio heads in a loop configuration with the CRI, generating a data link frame at the CRI, filling the data link frame at the CRI with receive data to be transmitted to the radio heads, the data link frame being divided into a plurality of segments, and forwarding the data link frame from the CRI to a first radio head and thereafter to each remaining radio head in succession to the last radio head.
  • receive data is extracted from a first segment in the data link frame and transmit data to be transmitted by the radio head to the CRI is inserted into the first segment or into a second segment in the data link frame.
  • a mobile communications system and method according to the present invention requires only one transmit and one receive connection between radio heads and thus requires only one T1/E1 interface circuit at each radio head. This may significantly reduce the cost of the system by eliminating one T1/E1 interface circuit from each radio head, and reduce the cost of connection (cable) by requiring only a uni-directional connection rather than a bi-directional one, as compared to prior art implementations. Additionally, a communications system according to the present invention fully utilizes the bandwidth of the communications channel by eliminating empty groups of time slots from the data link frame.
  • Figure 1 shows a mobile communications system connected to a localized wireless telephone system.
  • Figure 2 shows a prior art localized wireless telephone system with a plurality of radio heads connected in series with a control radio interface.
  • Figure 3 shows a localized wireless telephone system according to one aspect of the present invention with a plurality of radio heads connected in a loop configuration with a control radio interface.
  • Figure 4 is a functional block diagram of a single radio head interface circuit.
  • Figure 5 is a flow chart depicting the radio head data link interface operation, according to the present intention.
  • Figure 6 shows a second embodiment of the localized wireless telephone system according to the present invention with a plurality of radio head pairs connected in a dual loop configuration with a control radio interface.
  • Figure 7 shows a third embodiment of the localized wireless telephone system according to the present invention with a plurality of radio heads connected in an extended dual loop configuration with a control radio interface.
  • Figure 8 shows a fourth embodiment of the localized wireless telephone system according to the present invention with a plurality of radio heads connected in a bandwidth doubling, dual loop configuration with a control radio interface.
  • FIG. 1 is a block diagram of a wireless communications system, denoted generally by the numeral 10.
  • the wireless communications system 10 comprises a plurality of mobile terminals 12 and a Public Land Mobile Network (PLMN) 14.
  • PLMN 14 comprises a plurality of base stations 6, which are connected via a mobile services switching center (MSC) 18 to a terrestrial communications network, such as the Public Switched Telephone Network (PSTN).
  • MSC mobile services switching center
  • PSTN Public Switched Telephone Network
  • Each base station 16 is located in, and provides service to, a geographic region referred to as a cell, in general, there is one base station 16 for each cell within the PLMN 14.
  • Within each cell there may be a plurality of mobile terminals 12 that communicate via radio link with a serving base station 16.
  • Base station 16 allows the users of the mobile terminals 12 to communicate with other mobile terminals 12, or with users connected to the PSTN.
  • the MSC 18 routes calls to and from the mobile terminals 12 through the appropriate base station 16.
  • LWTS 20 is a private wireless telephone network that is typically installed in a building.
  • the LWTS 20 allows employees or other persons working within the building to use a conventional mobile terminal 12 as an office telephone.
  • the LWTS 20 connects with the MSC 18 in the mobile communications network 10.
  • MSC 18 in the mobile communications network 10.
  • FIG 2 shows a typical prior art LWTS 20.
  • LWTS 20 comprises a control and radio interface (CRI) 22 and a plurality of transceiver stations, which are referred to herein as radio heads 24.
  • CRI control and radio interface
  • Each radio head 24 comprises a transmitter and a receiver for communicating via wireless radio link with mobile terminals 12 within the coverage area of the radio head 24.
  • the radio heads 24 are typically situated within a building to provide radio coverage to at least a portion of the building. In the configuration shown in Figure 2, four radio heads 24 are connected in series with the CRI 22.
  • Each radio head 24 has two link interface circuits 26 capable of receiving and transmitting T1 and E1 frames.
  • the CRI 22 communicates with the radio heads 24 by sending and receiving T1 or E1 frames.
  • T1 frames are subdivided into twenty-four data time slots.
  • E1 frames are subdivided into thirty-two data time slots.
  • Each time slot in a T1 or E1 frame comprises eight bits.
  • Each T1 connection uses two twisted pairs of wires, one pair for downlink communications and one pair for uplink communications.
  • the E1 connection is similar, using either two twisted pairs or two coaxial cables.
  • Each data link frame thus comprises at least twenty-four time slots.
  • the time slots are organized into groups of time slots, one group for each radio head 24. In the disclosed aspects of the present invention, each group comprises six time slots, though the number of time slots in a particular group is not a material part of the invention.
  • the data link frame is passed sequentially down the chain of radio heads 24.
  • receive data is extracted from the left-most group of time slots.
  • Receive data is data received from the CRI 22 at the radio head 24.
  • Receive data may comprise data that is being transmitted from radio head 24 to a mobile terminal 12 (e.g., voice data) or signaling data transmitted from the CRI 22 to the radio head 24.
  • the remaining data in the data link frame is shifted to the left by one group of six time slots.
  • the modified data link frame is then passed to the next radio head 24. This process is repeated at each radio head 24.
  • the data link frame is then passed to the next radio head 24.
  • each radio head 24 shifts the data in the data link frame to the right by one group of six time slots, inserts its transmit data into the left-most group of six time slots, and sends the modified data link frame to the next radio head 24.
  • This process is repeated at each radio head 24 until the data link frame reaches the CRI 22.
  • null data is present in each stage of the transmit chain except the first downlink stage and the last uplink stage.
  • null data refers to groups of time slots in the data link frame in which no useful data is present. The actual bits present may be all 1 's or all 0's, may represent previously read, written, or shifted data that has not been altered, or may be random.
  • null data is effectively shifted from the right into the data link frame as the data link frame is passed down the chain of radio heads 24.
  • null data is shifted out of the data link frame as each radio head 24 inserts its transmit data into the data link frame. Additionally, each radio head 24 requires two link interface circuits 26.
  • FIG 3 is a schematic diagram of a localized wireless telephone system (LWTS), denoted generally by the numeral 100, according to the present invention.
  • LWTS 100 comprises a control radio interface (CRI) 108 and a plurality of radio heads 110 connected in a loop configuration with CRI 108.
  • Each radio head 110 includes a link interface circuit 112, shown in more detail in Figure 4, providing both uplink and downlink communications. In the embodiment shown in Figure 3, only one link interface circuit 112 is required, though additional link interface circuits 112 could be present.
  • Data is transmitted between the CR1 108 and radio heads 110 in frames, referred to herein as data link frames 150.
  • the most straightforward implementation would assign the same number of time slots in the data link frame 150 to each radio head 110. This can be accomplished by dividing the data link frame 150 into a plurality of equal length time slots, and organizing these time slots into groups.
  • the number of groups of time slots in the disclosed embodiment equals the number of radio heads 110 in the link chain.
  • the length of the time slots does not have to be equal, nor do groups have to contain an equal numbers of time slots.
  • two or more radio heads 110 could share a single group of time slots. This can be accomplished, for example, by having one radio head 110 use the group of time slots in even-numbered data link frames 150 and having a second radio head 110 use the same group of time slots in odd-numbered data link frames 150.
  • the straightforward implementation where the data link frame 150 is divided into equal length time slots organized into groups corresponding in number to the number of radio heads 110, will be used.
  • groups of time slots within a data link frame are referred to herein as data link frame "segments,” denoted in all relevant figures by the number 152.
  • the state of the data link frame 150 is indicated at each stage of the link chain, i.e., prior to receipt by, and following transmission by, each radio head 110.
  • the first radio head 110 upon receiving the data link frame 150, extracts receive data from the leading (e.g., left-most) segment 152, shifts all remaining data forward (e.g., left) by one segment 152, inserts transmit data into the trailing (e.g., right-most) segment in the data link frame 150, and transmits the modified data link frame 150 to the next radio head 110 in the link chain. All radio heads 110 in the link chain perform the same sequence of operations, regardless of their relative location within the link chain. The last radio head 110 transmits the data link frame 150 back to the CR1 108.
  • the data link frame 150 is fully packed with data at each transmission step in the link chain.
  • the data link frame 150 contains the transmit data from all previous radio heads 110 in the link chain, and the receive data for all of the radio heads 110 remaining in the link chain.
  • the data link channel bandwidth is thus fully utilized, and only uni-directional communication links between connected devices are required.
  • leading denotes the segment 152 at one end of the data link frame; the term “forward” refers the direction toward the leading group (for data shifting); and the term “trailing” refers to the segment 152 at the opposite end of data link frame 150.
  • leading denotes the left-most segment 152; “forward” denotes the left direction; and “trailing” denotes the right-most segment 152 in data link frame 150.
  • FIG. 4 is a functional block diagram of an interface circuit 112 for the radio head 110 shown in Figure 3.
  • the interface circuit 112 includes an Input/Output (I/O) circuit 114 and a data manipulation circuit 116.
  • I/O circuit 114 provides a physical connection between the radio head 110 and the communication link, which is typically a T1 or E1 line.
  • I/O circuit 114 includes a frame reception circuit 118 and a frame transmission circuit 120.
  • a data link frame 150 transmitted from a previous node in the chain is received and captured by the frame reception circuit 118.
  • the data link frame 150 is then passed to the data manipulation circuit 116.
  • Receive data is extracted from the leading segment (comprising n bits) of the data link frame 150 by data extraction circuit 122.
  • the remaining bits in the data link frame 150 are then shifted forward by one segment (n bits) by bit shifting circuit 124. Transmit data is inserted into the trailing segment (n bits) by data insertion circuit 126.
  • the data link frame 150 then passes back to I/O circuit 114 where it is transmitted to the next radio head 110 in the chain (or from the last radio head 110 in the chain, to the CRI 108) by frame transmission circuit 120.
  • the steps of extracting, shifting, and inserting may be implemented efficiently by means of a shift register, a time switch, microprocessor programmed with appropriate software, or other methods well known in the art. Additionally, one of ordinary skill in the art will recognize that the data extraction, bit shifting, and data insertion functions may, in any given implementation, be combined. For example, these functions may be implemented in a shift register or time switch. Similarly, the frame reception and frame transmission functions may be combined in a single communication interface (e.g., a T1 or E1 interface).
  • FIG. 5 is a flow chart illustrating the operation of each radio head 110 in the link chain.
  • Block 200 represents a wait state, wherein the radio head 110 awaits receipt of a data link frame 150.
  • the radio head 110 extracts receive data from the leading n bits (block 202) (where n represents the number of bits in the leading segment 152), and shifts all data in the data link frame 150 forward by n bits (block 204). Additionally, radio head 110 inserts its transmit data into the trailing n bits (block 206). After receive data is extracted and transmit data is inserted, the radio head 110 transmits the resulting data link frame 150 to the next device in that the link chain (or, for the last device in the chain, to the CRI 108)(block 208).
  • Figure 6 illustrates an alternate embodiment of the invention using a dual ring topology.
  • a centralized CRI 108 is connected to eight radio heads 110 arranged in two communication loops.
  • the radio heads 110 are arranged in pairs at radio head sites 115.
  • Each radio head site 115 requires two T1 or E1 interface circuits, and each of the two communication loops requires a T1 or E1 link.
  • the data link frame 150 for each of the two communication loops comprises four segments 152, each comprising six time slots.
  • Each radio head 110 extracts receive data from the leading segment 152 of the data link frame 150 associated with a corresponding loop, shifts the frame data forward by one segment 152, inserts its transmit data in the trailing segment 152, and transmits the modified data link frame 150 to the next device in the link chain.
  • Figure 6 depicts the state of the data link frame 150 for each of the two communication loops at each communication link, i.e., prior to receipt by, and following transmission by, each radio head 110.
  • This configuration allows full utilization of existing radio head infrastructure comprising two T1/E1 interface circuits and two T1/E1 communication links per radio head site 115, while supporting an additional radio head 110 co-located at each radio head site 115.
  • FIG. 7 illustrates another embodiment of the present invention using an extended dual ring topology.
  • a centralized CR1 108 is connected to eight radio heads 110.
  • Each radio head 110 contains at least two T1 or E1 interface circuits, designated as primary and secondary.
  • the eight radio heads 110 are each connected to two communication loops.
  • Each of the two communication loops is unidirectional, requires half of a single T1 or E1 bi-directional link, and is connected to the radio heads 110 in opposite order and direction.
  • the first communication loop transmits data from the CRI 108 to the first radio head 110 in the link chain, and then successively to each radio head 110 in ascending order, finally transmitting from the last radio head 110 back to the CRI 108.
  • the first communication loop connects to the receive side of the primary interface and the transmit side of the secondary interface for the first set of four radio heads 110, and connects to the receive side of the secondary interface and the transmit side of the primary interface for the second (or last) set of four radio heads 100.
  • the second communication loop transmits data from the CR1 108 to the last radio head 110 in the link chain (as compared to the first loop), and then successively to each radio head 110 in descending order, finally transmitting from the first radio head 110 back to the CRI 108.
  • the second communication loop connects to the receive side of the primary interface and the transmit side of the secondary interface for the first four radio heads 110 in its loop, and connects to the receive side of the secondary interface and the transmit side of the primary interface for the last four radio heads 100.
  • This convention obviates the need for each radio head 110 to "know" where in the respective communication loops it is located, i.e., all radio heads 110 follow the same procedure as described below, regardless of their position.
  • the data link frame 150 for each of the two extended communication loops comprises four segments 152 of six time slots each.
  • each radio head 110 For data link frames 150 received at its primary interface (i.e., for the first four radio heads 110 in each loop), each radio head 110 extracts receive data from the leading segment 152, shifts the frame data forward by one segment 152, inserts its transmit data in the trailing segment 152, and transmits the modified data link frame 150 to the next radio head 110 in the chain.
  • each radio head 110 re-transmits the data link frame 150 unmodified to the next radio head 110 in the link chain, i.e., without altering any data within the data link frame 150.
  • Figure 7 depicts the state of the data link frame 150 for each of the two extended communication loops at each communication link, i.e., prior to receipt by, and following transmission by, each radio head 110.
  • This arrangement allows full utilization of existing radio head 110 infrastructure comprising two T1/E1 interface circuits and two T1/E1 communication links per radio head 110, and allows for up to twice the number of radio heads 110 to be connected.
  • another alternative embodiment uses a dual communication loop topology to double the available data communication bandwidth.
  • a CRI 108 is connected to four radio heads 110 by two communication loops.
  • the data link frame 150 for each communication loop contains one segment 152 of six time slots per radio head 110.
  • Each radio head 110 requires two T1 or E1 interface circuits, and each of the two communication loops requires a single T1 or E1 link.
  • Each radio head 110 is connected to each of the two communication loops.
  • the communication loops connect the CRI 108 to the cascaded radio heads 110 in opposite directions.
  • the first radio head 110 in each communication loop corresponds to the last radio head 110 in the other communication loop.
  • Each radio head 110 extracts receive data from the leading segment 152 of the data link frame 150 in each communications loop, shifts the frame data forward by one segment 152, inserts its transmit data in the trailing segment 152, and transmits the modified data link frame 150 to the next radio head in the communication loop.
  • each radio head 110 Since each radio head 110 is connected to each of the two communication loops, each radio head 110 receives two segments 152 of receive data, and transmits two segments152 of transmit data, thus effectively receiving and transmitting two segments, or twelve time slots, of data.
  • Figure 8 depicts the state of the data link frame 150 for each of the two communication loops at each communication link, i.e., prior to receipt by, and following transmission by, each radio head 110. This arrangement allows full utilization of existing radio head 110 infrastructure comprising two T1/E1 interface circuits and two T1/E1 communication links per radio head 110, while doubling the data bandwidth to each radio head 110.
  • data link frames 150 comprising segments 152 corresponding to the number of radio heads 110 (e.g., four or eight in the above arrangements), and wherein each segment 152 contained an equal number of time slots (e.g., six), it will be recognized that none of these parameters are essential parts of or limitations to the broad practice of the present invention.
  • Data link frames 150 may, for example, comprise any number of segments 152, which themselves may comprise any number of time slots.
  • the number of segmentsl 52 need not necessarily correspond to the number of radio heads 110 in a loop communication, and the number of time slots need not necessarily be the same in each segment 152.
  • Data extraction and insertion in data link frame 150 need not be from the leading and trailing segments 152, respectively, and data within data link frame 150 need not be shifted. While many of the above explicated configurations of radio head communication links provide the significant advantage of radio head location independence within a communication loop, the features enabling this are not essential to the present invention; many configurations are possible within the broad practice of the present invention which would require radio head 110 relative loop position data to effect proper communications.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Small-Scale Networks (AREA)
  • Time-Division Multiplex Systems (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

L'invention concerne l'application d'une topologie en anneau à une liaison de communication reliant une pluralité de têtes de radio à une interface radio de commande. Des données dans la liaison sont transmises dans des trames de liaison de données multiplexées de manière temporelle comprenant des segments ou des groupes d'intervalles. Chaque tête de radio dans la boucle de communication reçoit une trame de liaison de données à partir de la tête de radio précédente, extrait les données reçues à partir du segment avant, décale les données restantes vers l'avant dans la trame de liaison de données, introduit les données transmises dans le segment arrière et transmet la trame de liaison de données obtenue à la tête de radio suivante dans la boucle. La boucle de communication est unidirectionnelle et chaque tête de radio nécessite seulement une interface de liaison de données bidirectionnelle. L'invention concerne également différentes topologies d'interconnexions, par exemple, l'extension de la boucle de communication de manière à ce qu'elle inclut plusieurs têtes de radio et l'accroissement de la largeur de bande de communication, au moyen de plusieurs boucles de communication.
PCT/US2001/023527 2000-08-15 2001-07-26 Procede d'utilisation d'une topologie en anneau dans des voies de communication reliant des tetes de radio en cascade WO2002015436A2 (fr)

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AU2001280808A AU2001280808A1 (en) 2000-08-15 2001-07-26 A method to utilize ring topology in communication channels linking cascaded radio heads

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US09/639,192 2000-08-15

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1570685A1 (fr) * 2002-12-03 2005-09-07 ZTE Corporation Systeme de communication a spectre etale
EP1570685A4 (fr) * 2002-12-03 2011-05-25 Zte Corp Systeme de communication a spectre etale

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AU2001280808A1 (en) 2002-02-25

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