EP1000518A1 - Procede et dispositif de transfert intercellulaire souple - Google Patents

Procede et dispositif de transfert intercellulaire souple

Info

Publication number
EP1000518A1
EP1000518A1 EP98937968A EP98937968A EP1000518A1 EP 1000518 A1 EP1000518 A1 EP 1000518A1 EP 98937968 A EP98937968 A EP 98937968A EP 98937968 A EP98937968 A EP 98937968A EP 1000518 A1 EP1000518 A1 EP 1000518A1
Authority
EP
European Patent Office
Prior art keywords
target
source
architecture
link
signaling
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP98937968A
Other languages
German (de)
English (en)
Inventor
Jianping Jiang
Azeem Ahmad
Jerri L. Turner-Harris
Baji Edupuganty
William Edward Illidge
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Ahmad Azeem
Edupuganty Baji
ILLIDGE, WILLIAM EDWARD
Jiang Jianping
Turner-Harris Jerri L
Nortel Networks Ltd
Original Assignee
Nortel Networks Ltd
Nortel Networks Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Nortel Networks Ltd, Nortel Networks Corp filed Critical Nortel Networks Ltd
Publication of EP1000518A1 publication Critical patent/EP1000518A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/0005—Control or signalling for completing the hand-off
    • H04W36/0055—Transmission or use of information for re-establishing the radio link
    • H04W36/0072—Transmission or use of information for re-establishing the radio link of resource information of target access point
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/0005—Control or signalling for completing the hand-off
    • H04W36/0055—Transmission or use of information for re-establishing the radio link
    • H04W36/0066—Transmission or use of information for re-establishing the radio link of control information between different types of networks in order to establish a new radio link in the target network
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/16—Performing reselection for specific purposes
    • H04W36/18—Performing reselection for specific purposes for allowing seamless reselection, e.g. soft reselection

Definitions

  • the present invention relates in general to soft handoffs and in particular to methods and systems for establishing soft handoffs between two CDMA base stations (BSs) using a direct base station (BS) to BS link even where the SDUs associated to the BS comprise part of different configuration systems.
  • BSs CDMA base stations
  • BS direct base station
  • Handoff is the process by which a new air interface channel between a mobile station and a base station is established.
  • a “hard handoff” is a handoff which requires a mobile station to tune its radio equipment or to reestablish synchronization.
  • a “soft handoff” is a handoff that does not require the mobile station to tune its radio equipment or to reestablish synchronization and that uses the same frame selection function for (and voice trans-coding function, if this is a voice call) in the network for both the old and new air interface channels.
  • Other types of handoffs, such as a semi soft handoff are not pertinent to an understanding of the present invention.
  • CDMA code division multiple access
  • the process of establishing a soft handoff from the time an MS sees a new pilot signal, received from a nearby base transceiver station (BTS) defining another cell, to the time an MS sends a handoff completion message can be segregated into at least three phases .
  • Phase 1 may be defined as occurring from the time the MS sees a new pilot to the time that the pilot strength exceeds a predetermined threshold and may be referred to as the detection phase.
  • Phase 2 may be defined as occurring between the time an MS sends a pilot strength measurement (PSM) message until it receives a handoff direction message and may be referred to as the establishing phase (when successful) .
  • Phase 3 may be defined as the time from when an MS receives a handoff direction message to the time the MS sends a handoff completion message and may be referred to as the completion phase.
  • PSM pilot strength measurement
  • the IS-634 standard has defined and standardized communications between a mobile switching center (MSC) and a BS by industry agreement such that different manufacturers equipment could be combined into a composite cellular system by a user.
  • MSC mobile switching center
  • This standard has not previously attempted to standardize any signaling messages between base stations.
  • signaling messages bound from a source base station to a target base station must be first relayed to an MSC in a standardized manner and protocol before being received by the target base station.
  • adjacent cells must operate at the same frequency. Once an MS detects a new pilot, the MS may experience same frequency interference from adjacent cells.
  • 12 consecutive bad frames detected by an MS may cause the MS to drop a call.
  • the total network processing time that may cause a call to be dropped is primarily a function of the phase 2 time period. At this time the received signal has already degraded enough that a handoff has been requested. This typically means that the MS is still moving away from its signal source. Thus the degradation of received signal quality, before handoff completion, may result in the occurrence of 12 consecutive bad frames as detected by the MS.
  • One prior art system used 12 steps and including the transmission of 12 messages for an intra-system inter-BS handoff during phase 2.
  • the series of setup and request messages went from the MS, to the serving BTS, to the selection/distribution unit (SDU) , the serving base station controller (BSC) , the mobile switching center (MSC) , the target BSC, and the target BTS.
  • the response messages came from the target BTS to the target BSC, the MSC, the serving BSC, the SDU and finally the serving BTS.
  • SDU selection/distribution unit
  • MSC mobile switching center
  • base stations whether identical or made by different manufacturers, could communicate directly with one another to establish a soft handoff of an MS across cellular boundaries of communication cells managed by different base stations.
  • An Architecture A network infrastructure is distinguished by the fact that the voice coding and frame selection function of the SDU is always located at the source base station.
  • An Architecture B network infrastructure is distinguished by the fact that the voice coding and frame selection function of the SDU is located remote from the source base station and thus requires the use of an A4 communication interface as defined in the standard.
  • a typical location for the SDU in an architecture B network is in the MSC although it may, if so desired, be physically isolated from the rest of the system.
  • the present invention comprises providing a soft handoff signaling channel or communication link directly between source and target systems.
  • This communication link in combination with an enhanced signaling link from the source SDU to the target BS, operate to permit the transmission of both signaling and voice information from the SDU, and removes the involvement of the MSC from the soft handoff establishing phase process.
  • FIGURE 1 is a basic block diagram illustrating the mechanism whereby a soft handoff occurred in the prior art regardless of network architecture;
  • FIGURE 2 is a basic block diagram illustrating the mechanism whereby a soft handoff occurred in the prior art between architecture A networks as described in the above referenced patent application;
  • FIGURE 3 is a basic block diagram illustrating the mechanism for providing a direct link for soft handoff between architecture B networks instead of involving IS-41 in the soft handoff establishing phase;
  • FIGURE 4 is a basic block diagram illustrating the mechanism for providing a soft handoff between architecture A and architecture B networks
  • FIGURE 5 is a block diagram illustrating the mechanism for providing a soft handoff where the source, of an inter- architecture soft handoff, is an architecture B type network;
  • FIGURE 6 is a block diagram illustrating the mechanism for providing a soft handoff where the source, of an inter- architecture soft handoff, is an architecture A type network;
  • FIGURE 7 illustrates, in a message time sequence diagram form, a methodology of the establishment phase of a soft handoff between two type A architecture systems
  • FIGURE 8 illustrates, in a message time sequence diagram form, a methodology of the establishment phase of a soft handoff between two type B architecture systems
  • FIGURE 9 illustrates, in a message time sequence diagram form, a methodology of the establishment phase of a soft handoff between two systems where the source is a type A architecture and the target is type B architecture;
  • FIGURE 10 illustrates, in a message time sequence diagram form, a methodology of the establishment phase of a soft handoff between two systems where the source is a type B architecture and the target is type A architecture.
  • the referenced copending application is directed to the idea of adding a communication link between base stations to bypass or eliminate the requirement of signals passing through the MSC.
  • the concept as presented therein is not readily implementable as applied to CDMA architecture B type systems or to a SHO. between systems having different architecture types.
  • Each link may terminate logically at different entities in different architecture type systems. This flexibility of link termination provides the inter-operability necessary in establishing direct links between certain entities in different architecture type systems and as required to remove the involvement of the MSC from the soft handoff establishing phase of the operation.
  • MSC 10 is connected via a communication link 12 to a cloud designated as 14 and also labeled STP .
  • STP refers to a signal transfer point, gateway or other signal switching network such as the public switched telephone network (PSTN) .
  • PSTN public switched telephone network
  • the link 12 transfers data according to an IS-41 protocol as referenced in the previously mentioned industry standard.
  • Cloud 14 is further connected via a link 16 to a further MSC block 18.
  • Link 16 also conforms to the IS-41 protocol.
  • a base station block 20 is connected via a communication link 22 to MSC 18.
  • the communication link 22 conforms to IS-634 standards.
  • a further base station 24 is connected via a communication link 26 to MSC 10.
  • Link 26 also conforms to the IS-634 protocol.
  • a circle 28 represents a mobile station (MS) that is moving from the base station 24 towards base station 20.
  • An airwave communication link 30 represents communications between MS 28 and base station 24.
  • a dash line 32 represents airwave communications between MS 28 and base station 20.
  • the cellular system represented by blocks 10 and 24 may be either an architecture A or architecture B type system as defined in IS-634. As shown in the drawing, the same applies to a second cellular system represented by blocks 18 and 20.
  • FIG. 2 provides the basic components involved in a soft handoff between two systems conforming to architecture A. This is the model used in the referenced patent application.
  • An MSC block 40 communicates over a link 42, through a cloud 44 and a further link 46 with a second MSC 48 in the same manner as shown in FIGURE 1.
  • MSC 40 also communicates with a BS 50 over a link 52 conforming to IS- 634 standards.
  • a further BS 54 communicates with MSC 48 over a communication link 56 where 56 is IS-634 compliant.
  • Both BSs 50 and 54 actually comprise at least one BSC and normally a plurality of BTSs .
  • a communication link is shown providing a direct connection between a voice and signaling (V/S) portion of BS 50 and a similar portion of BS 54.
  • V/S voice and signaling
  • the V/S portion in most CDMA systems comprise an SDU and associated soft handoff controller (SHC) .
  • SHC soft handoff controller
  • a interconnection function (ICF) block (not shown) may be required in older system designs to transmit data over the link 58 in a protocol that complies with an accepted industry standard.
  • the mobile station 28 has been communicating with base station 24.
  • the mobile station 28 receives pilot signals from BS 20 of increasing amplitude.
  • the mobile station 28 informs base station 24 that it wants to be transferred to the system represented by base station 20.
  • the base station 24 informs MSC 10 which transfers messages over communication link 12 through STP 14 and eventually to BS 20.
  • BS 20 allocates resources so that it may communicate with mobile station 28. Messages are then sent back through STP 14 to base station 24 to acknowledge that BS 20 is prepared to complete a connection with mobile station 28.
  • the process of transferring these messages and the many steps involved, when using only MSC to MSC communication, is set forth in detail in the referenced patent application.
  • the referenced patent application is directed to the idea of providing direct BS to BS signaling to establish the soft handoff connection.
  • the invention suggested that one method of accomplishing this soft handoff signaling link is to enhance an existing voice and signaling communication channel designated in the standards as A3.
  • A3 Such a system is illustrated in FIGURE 2.
  • FIGURE 3 shows the same concept applied to a handoff between architecture B type systems.
  • one system comprises an MSC 70 and a BS 72.
  • a second system comprises an MSC 74 and a BS 76.
  • IS-41 links connect the two MSCs together via an STP cloud 78.
  • a direct link labeled as 80 provides signaling and voice communication between the appropriate components of the two systems necessary to establish a soft handoff.
  • Non designated communication links interconnect the MSC and its associated BS and these links are IS-634 compliant. While the number of message steps saved may be slightly less than occurs between two architecture A systems, the time saved may still be significant .
  • FIGURE 4 A further significant advantage will be apparent from an examination of FIGURE 4 where a soft handoff is shown occurring between two different architecture type systems.
  • An architecture B system is shown having the basic components of an MSC 90 and a BS 92.
  • An architecture A system is shown having the basic components of an MSC 94 and a BS 96.
  • IS-41 links connect the two MSCs together via an STP cloud 98.
  • a V/S to V/S direct link labeled as 100 provides signaling and voice communication between the appropriate components of the two systems necessary to establish a soft handoff.
  • Non designated communication links interconnect the MSC and its associated BS and these links are IS-634 compliant.
  • any architecture type system may establish a soft handoff with another system without having to pass the establishing messages to the STP cloud.
  • FIGURE 4 The inter-operability approach set forth in FIGURE 4 is expanded upon in FIGURES 5 and 6 and the manner in which messages are exchanged between systems for four different source and target combination possibilities is presented in FIGURES 7 through 10.
  • a network or switch mechanism labeled as STP and given a designation of 110 is connected to each of a plurality of MSC blocks 112, 114, 116 and 118 over IS-41 compliant communication links.
  • MSCs 112 and 114 provide the main switch function for two architecture A type cellular systems.
  • MSCs 116 and 118 provide the main switch function for two architecture B type cellular systems.
  • Each of the MSCs is connected to base station equipment over IS-634 compliant communication links.
  • MSC 112 controls a BSC 120 which in turn controls a first plurality of BTSs 122 and a second plurality of BTSs 124.
  • SDU block 126 Internal to BSC block 120 there is shown an SDU block 126.
  • MSC 114 controls a BSC 128 which in turn controls a plurality of BTSs 130.
  • SDU block 132 Internal to BSC block 128 there is shown an SDU block 132.
  • MSC 116 controls a BSC 134 which in turn controls a plurality of BTSs 136.
  • SDU block 138 Internal to MSC block 116 there is shown an SDU block 138.
  • MSC 118 controls a BSC 140 which in turn controls a plurality of BTSs 142.
  • SDU block 144 Internal to MSC block 118 there is shown an SDU block 144.
  • ATM clouds 146, 148 and 150 provide direct V/S to V/S interconnection between the four cellular systems.
  • the connections are shown as solid, dashed and dotted lines for different types of communications.
  • the bold solid lines designated A3T represents A3 protocol voice or data (traffic) packets
  • the dotted line designated as A3S represents A3 protocol signaling data packets
  • the dash line designated as A7 represents a data packet protocol for passing resource allocation signaling type messages.
  • MS 152 is shown as being handed off from a source system using one of the BTSs 124 to a target system using one of the BTSs 130.
  • MS 154 is shown as being handed off from one of a set of source BTS 136 to one of the set of target BTSs 130.
  • MS 156 is illustrated as being handed off from one of the source BTSs 136 to one of the target BTSs 142.
  • the cellular systems using BSCs 120 and 134 are further labeled SOURCE while the systems using BSCs 128 and 140 are further labeled TARGET in accordance with the above paragraph.
  • the A3 and A7 communication links as shown are used to help illustrate the paths messages travel in performing a soft handoff between a source system and a target system in the practice of this invention.
  • the source and target systems are both architecture A type systems all communications take place between the BSCs as shown in connection with ATM 146.
  • the A3 protocol signaling and voice messages are transferred between the BSs in each of the two systems .
  • the A7 resource allocation messages are transferred between the soft handoff controllers internal the respective BSCs to transfer a handoff request and the response acknowledgement to that request between the appropriate BTS entities.
  • a network or switch mechanism labeled as STP and given a designation of 200 is connected to each of a plurality of MSC blocks 202, 204, 206 and 208 over IS-41 compliant communication links.
  • MSCs 202 and 204 provide the main switch function for two architecture A type cellular systems.
  • MSCs 206 and 208 provide the main switch function for two architecture B type cellular systems.
  • Each of the MSCs is connected to base station equipment over IS-634 compliant communication links.
  • MSC 202 controls a BSC 210 which in turn controls a first plurality of BTSs 212 and a second plurality of BTSs 214.
  • SDU block 216 Internal to BSC block 210 there is shown.
  • MSC 204 controls a BSC 218 which in turn controls a plurality of BTSs 220.
  • SDU block 222 Internal to BSC block 218 there is shown an SDU block 222.
  • MSC 206 controls a BSC 224 which in turn controls a plurality of BTSs 226.
  • SDU block 228 Internal to MSC block 206 there is shown an SDU block 228.
  • MSC 208 controls a BSC 230 which in turn controls a plurality of BTSs 232.
  • ATM clouds 236, 238 and 240 provide direct V/S to V/S interconnection between the four cellular systems.
  • the connections are shown as solid, dashed and dotted lines for different types of communications.
  • the bold solid lines designated A3T represents A3 protocol voice (traffic) data packets
  • the dotted line designated as A3S represents A3 protocol signaling data packets
  • the dash line designated as A7 represents a data packet protocol for passing resource allocation signaling type messages.
  • MS 242 is shown as being handed off from a source system using a BTS such as 220 to a target system using one of the BTSs such as 214.
  • MS 244 is shown as being handed off from one of a set of source BTSs 220 to one of the set of target BTSs 226.
  • MS 246 is illustrated as being handed off from one of the source BTSs 232 to one of the target BTSs 226.
  • the cellular systems using BSCs 218 and 230 are further labeled SOURCE while the systems using BSCs 210 and 224 are further labeled TARGET in accordance with the above paragraph.
  • the A3 and A7 communication links as shown are used to help illustrate the paths messages travel in performing a soft handoff between a source system and a target system in the practice of this invention.
  • an MS is labeled 300 and is shown sending a pilot strength measurement signal to a BS block 302 which represents a combination of BTS/SDU/SHC/ICF entities since the communication link interconnections of these entities are proprietary to each manufacturer.
  • the block 302 and an MSC1 block 304 represent a source system.
  • An MSC2 block 306 in combination with a BS block 308 represents a target system.
  • the block 308 represents a combination of BTS/SDU/SHC/ICF entities.
  • the messages passed illustrate the time sequence of messages, labeled from "a" to "1", when a soft handoff is being established between two type A systems. This would be representative of a soft handoff between the two left hand systems of either FIGURES 5 or 6.
  • the source BS When the source BS determines that one or more cells at a target BS are needed to support an already established call, it sends an A7 Handoff Request to the target BS as shown in line "b" .
  • the target BS initiates an A3S connection by sending a Connect message in return. (Although only one connect message is shown, multiple connect messages may occur if the request includes multiple cells.) Acknowledgments soon follow both the HO request and connect messages . Forward frames are commenced from the source to the target BS as shown in line “f” as soon as synchronization is established. A message is then sent to the target BS to begin forwarding traffic frames to the MS as set forth in lines "g" and “h” . An acknowledgement message is sent in line "j".
  • the source MSC is informed that the HO has been performed.
  • the MSC is bypassed from the establishment phase and is merely informed that the HO is complete after the fact .
  • the messages used in the establishment phase of a soft handoff between B architecture type systems in accordance with this invention are presented in FIGURE 8.
  • the SDU in B architecture type systems is not located in the base station. It may be isolated by itself but is often found in proximity to an MSC as shown in both FIGURES 5 and 6.
  • a MS labeled as 350 may represent either MS 156 in FIGURE 5 or MS 246 in FIGURE 6.
  • a BSC block 352, an SDU block 354 and an MSC1 block 356 represent a source system through which the MS 350 has been communicating.
  • a MSC2 block 358, a BSC block 360 and a BTS block 362 represent a target system such as shown and labeled in FIGURES 5 and 6.
  • the pilot strength measurement signal is sent to the SDU 354 via an A3 communication link.
  • the A3 communication link is distinct from the previously 'discussed A3S and A3T communication links although the protocol used is the same.
  • a HO Request, as shown on line "c" is sent on an A4 communication link to the BSC represented by 352.
  • This request is then forwarded, as shown on line “d", over the A7 communication link to BSC 360 and is forwarded over a proprietary link to the BTS 362 representing an appropriate target BTS.
  • a connect signal is returned to the source SDU 354 over an A3S communication link as shown on line “e” .
  • the remaining signals utilized in establishing SHO in a type B architecture system are shown and a comparison with either FIGURE 5 or 6 will disclose the signal paths used to provide the communication link.
  • the MSC is not involved until the handoff is completed and a HO performed message is sent from the BSC to the MSC as shown in line "o" over communication link A7.
  • the signaling messages are substantially identical in both FIGURES 7 and 8 although some need to be forwarded in accordance with established protocols over standardized communication links, such as A4 and A3.
  • a block 400 represents an MS such as 154 in FIGURE 5.
  • a BSC block 402, an SDU block 404 and an MSC1 block 406 represents components of the source system in FIGURE 5 having MSC 116.
  • a target MSC2 block 408 and a BSC block 410 are representative of the system shown having MSC 114.
  • the block 410 includes at least the functional entities ICF, SHC and BTS used to respond to the intersystem messages used in this invention.
  • the BSC 402 forwards a HO request message subsequent to the occurrence of an appropriate pilot strength measurement message of line "a" and a resulting HO request message of line "b” .
  • This HO request message is received over communication link A7 from a BSC such as 134 in FIGURE 5.
  • a connect message as shown on line “d” , is returned over an A3S communication link to the SDU such as 138.
  • acknowledgment message of lines “e” and “f” are sent over communication links A3S and A7 respectively to the entities shown.
  • the remaining messages and communication links used are self evident in view of the material already discussed.
  • the messages provided in FIGURE 10 illustrate the entities involved in establishing a SHO between a source architecture A type system and a target architecture B type system such as may occur in connection with MS 244 in FIGURE 6.
  • a block 450 represents an MS while a BS block 452 and a MSCl block 454 represent a source system through which the MS has been communicating.
  • the BS block 452 includes, as before, at least entities such as a BTS, a SDU, a SHC and an ICF.
  • a target system is represented by MSC2 block 456, a BSC block 458 and a BTS block 460.
  • the HO request message is sent over the A7 communication link to BSC 458 which is inherently programed to forward same over a communication link, proprietary to type B architecture systems, to a BTS as represented by block 460 and such as one of those designated as 226 in FIGURE 6.
  • a connect signal is returned over the A3S communication link and then acknowledgments follow as described previously,
  • the remaining messages are transmitted and, when the SHO operation is completed, a message is sent to the MSC 454 and designated as 204 in FIGURE 6 that the HO has been performed.
  • the MSC again is not involved in the establishment phase until it is completed and thus does not act to impede the time required to complete the SHO operation.
  • the present invention thus establishes a methodology that not only bypasses the MSC when attempting a SHO operation between type A architecture systems as shown in the referenced patent application, but allows the MSC bypassing when attempting a SHO between different type systems.
  • a standardized set of signals is set forth herein whereby all CDMA systems can communicate for the purpose of establishing a SHO without involving the MSC.
  • Appendix A provides an example set of message-layout and information elements.
  • Allowable cause values arc: Soft linn-doff; Uplink quality; Uplink 14 strength; Downlink quality; Do nlink strcngUt; Distance; Interference; 15 belter cell (I.e., Power butlgct); ⁇ cstx. ⁇ sc to MSC Invoca ⁇ on; O ⁇ MAP 16 Intervention; IS-41 Invocation; pi i vale options.
  • This element contains the im-lc ⁇ l list of tatget cells In order of 18 predJcted best performance.
  • the fust instance will contain Uic MI /IMSI.
  • T is element Indicates the in -nested set vice conllgtirndon.
  • Hiese elements ate icqtiiicd when a packet mode channel Is being used
  • T his message Is sent from t e tarp.el US t ⁇ the stance DS. in iesjxH.se lo die l'M ⁇ HO Request, to indicate llial a target channel lias been allocated for handoff as requested.
  • Tids message is also used lo Initiate a layer 3 connection to si ⁇ p ⁇ it die lansfer of user ⁇ iforniadon for a newly added radio link in suit liand ⁇ lf .
  • 5 - element may be Included, l lic order ol die ciict t Identities must match
  • Tltis JL-S-vt ⁇ P message Is seal Uom the US l ⁇ li ⁇ cTMS in older lo indicate llial llie DS as 14 peifoMiied a handoff.
  • this message is senl from source BS lo llie 15 source MSC only when llie leleience cell has been changed upon completion of llie new 16 handoff.
  • the handoff may have been Inlctual ot in conjunction wilh another BS.
  • the 17 purpose of lids message is lo updale die call ⁇ .tiligui.iiuin for the MSC.
  • the Cell Identifier 18 List and channel identities rue optionally Included lot billing, trace, court ordered 19 surveillance, etc.
  • Allowable cause values arc: Uplink quality, Uplink slrengdi, Downlink 21 quality, Downlink strength, Distance, Interference, Detler cell (I.e., 22 Power budgel), Response lo MSC invocation, O ⁇ M&P intervention, 23 or Private opdotts.
  • Por 15-95 sou liaud ⁇ fT procedures Inter-DS soft 24 liandofT drop target; lnlci-US soft handolT add target; hilra-BS soft 25 handoff drop target; Inlin US soli handoir add target; Equipment Pailure.
  • Tlie 29 first cell on die list Is the iclcicucc cell.
  • Tlie algotid i of determining 30 of a rcfetence cell is on discretion or DS manufacturers.
  • Por 31 ⁇ NS1/E1M1 ⁇ -553 and 15-91. only one cell can be specified.
  • This element Is lequhtd when a packet mode channel Is being used lo 33 support die call.
  • This packet mode channel message is sen. hum th s ⁇ uiee US to the target BS l ⁇ 17 acknowledge successful completion of llie Packet Mode Ciiaiuiel co iecl operation.
  • This 18 message also triggeis llie Iransudssion of lot waul ii allic Irauies al lhe targel DS. If an error 19 has occurred in tlie ⁇ j>eraliun, tlie PMC Cause clement indicales the reason for tlie failure. 0
  • Tlie PMC Cause element must be present If a failure has occurred. Its absence Implies success.
  • This packet mode channel message is sent from die target BS to die source BS to indicate receiveiifg of reverse frames at the target BS.
  • his packel mode ciiaiuiel message is senl horn ii.e target DS lo tlie source BS to acknowledge successful complellon of a soil handoff drop largel. If an error lias occurred in the o
  • the MC Cause clement must be present if a failure has occurred. Its absence Implies success.
  • Allowable MC Cause vnlucs ate: I'livate long code not available or not supported.
  • Tlie length is 42 bits, citctnlcd in 6 octets, such that the 6 unused
  • 3 bils aie sel equal l ⁇ U', and occupy the high - ⁇ idci positions or Hie most significant octet.
  • 13 liis iniormalion element indicates Hie iiumbei ol subchannel involved in a soil liandolf for 14 power control purposes.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

L'invention concerne un procédé et un dispositif de transfert intercellulaire souple, au moyen d'une connexion à protocole standardisé et direct de station de base à station de base, sur un réseau, ce procédé permettant d'éviter la perte de temps provoquée par une liaison de communication d'un centre de commutation mobile à un autre centre de commutation mobile, au moyen du protocole IS-41. Ce nouveau protocole a récemment reçu l'agrément de l'industrie pour une utilisation entre systèmes AMCR (accès multiple par code de répartition) à différents types d'architecture, et il met en oeuvre les protocoles A7 et A3 tels que définis dans le standard IS-634 rev. A.
EP98937968A 1997-07-28 1998-07-22 Procede et dispositif de transfert intercellulaire souple Withdrawn EP1000518A1 (fr)

Applications Claiming Priority (5)

Application Number Priority Date Filing Date Title
US120103 1993-09-10
US5393997P 1997-07-28 1997-07-28
US53939P 1997-07-28
US12010398A 1998-07-21 1998-07-21
PCT/US1998/015048 WO1999007174A1 (fr) 1997-07-28 1998-07-22 Procede et dispositif de transfert intercellulaire souple

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EP1000518A1 true EP1000518A1 (fr) 2000-05-17

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DE202010018545U1 (de) 2009-01-21 2017-08-07 Streck Inc. Blutsammelröhrchen

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CN100337500C (zh) * 2004-05-12 2007-09-12 日本电气株式会社 无线基站设备设置系统和方法
DE202010018545U1 (de) 2009-01-21 2017-08-07 Streck Inc. Blutsammelröhrchen

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AU8659498A (en) 1999-02-22
WO1999007174A1 (fr) 1999-02-11
CA2299456A1 (fr) 1999-02-11

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