WO2000056107A1 - Improved message access for radio telecommunications system - Google Patents

Improved message access for radio telecommunications system Download PDF

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Publication number
WO2000056107A1
WO2000056107A1 PCT/GB1999/004180 GB9904180W WO0056107A1 WO 2000056107 A1 WO2000056107 A1 WO 2000056107A1 GB 9904180 W GB9904180 W GB 9904180W WO 0056107 A1 WO0056107 A1 WO 0056107A1
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WO
WIPO (PCT)
Prior art keywords
mobile
preamble
signal
message
send
Prior art date
Application number
PCT/GB1999/004180
Other languages
French (fr)
Inventor
David Lahiri Bhatoolaul
Seau Sian Lim
Qiang Cao
Original Assignee
Lucent Technologies Inc.
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 Lucent Technologies Inc. filed Critical Lucent Technologies Inc.
Priority to AU16711/00A priority Critical patent/AU1671100A/en
Priority to JP2000605433A priority patent/JP3686338B2/en
Priority to EP99959576A priority patent/EP1159848B1/en
Priority to DE69936401T priority patent/DE69936401T2/en
Priority to US09/936,101 priority patent/US7076262B1/en
Publication of WO2000056107A1 publication Critical patent/WO2000056107A1/en

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/04—TPC
    • H04W52/38—TPC being performed in particular situations
    • H04W52/48—TPC being performed in particular situations during retransmission after error or non-acknowledgment
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
    • H04L1/1607—Details of the supervisory signal
    • H04L1/1671—Details of the supervisory signal the supervisory signal being transmitted together with control information
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/04—TPC
    • H04W52/38—TPC being performed in particular situations
    • H04W52/50—TPC being performed in particular situations at the moment of starting communication in a multiple access environment
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access, e.g. scheduled or random access
    • H04W74/08—Non-scheduled or contention based access, e.g. random access, ALOHA, CSMA [Carrier Sense Multiple Access]
    • H04W74/0866—Non-scheduled or contention based access, e.g. random access, ALOHA, CSMA [Carrier Sense Multiple Access] using a dedicated channel for access

Definitions

  • This invention relates to an improved message access arrangement for a radio telecommunications system such as Universal Mobile Telecommunications System (UMTS) and relates especially to message acquisition indications.
  • UMTS Universal Mobile Telecommunications System
  • a mobile telephone sends its preamble at a first power, and waits for an acquisition indication on the Acquisition Indication Channel (AICH); if no indication is received, the preamble is resent at increased power, in steps, until an indication is received on the AICH.
  • the message is then sent and if no positive acknowledgement is received via the Forward Access Channel (FACH), the message is assumed to be corrupted and it is resent.
  • AICH Acquisition Indication Channel
  • FACH Forward Access Channel
  • a problem with this arrangement is that the base transceiver station must always have a sufficient level of hardware redundancy to ensure that the message parts of all detected preambles can be processed. This adds a high cost to the base transceiver station, and limits the number of access slots and preamble signatures allowed for each base transceiver station to achieve a given message throughput.
  • a radio mobile telecommunications system comprises a base transceiver station arranged to manage a plurality of mobile systems within at least one telecommunications cell; the base station having means to provide an acquisition indication channel by which an acknowledgement signal is sent to indicate that the strength of a preamble signal sent by that mobile system to the base transceiver station has reached a predetermined level; characterised in that said acknowledgement signal is arranged to indicate in addition that the mobile system must not immediately send a message signal.
  • Figure 1 is a schematic diagram of a part of a radio telecommunications system
  • Figure 2 illustrates a physical random access channel slots structure
  • Figure 3 illustrates the structure of a random access transmission
  • Figure 4 illustrates the structure of an access burst from a mobile
  • Figure 5 illustrates the message part of the random access burst
  • FIG. 6 illustrates the layers involved in message acknowledgement
  • Figure 7 illustrates how random access acquisition indication and forward access channels interact to acknowledge preamble and message signals from a mobile.
  • Figure 8 indicates RNCH and AICH messages in one embodiment of the invention.
  • Figure 9 indicates RACH and AICH messages in a second embodiment of the invention.
  • a part 10 of the UMTS is illustrated, comprising a plurality of mobile systems 10, 12, 14, 16 associated with a telecommunications cell controlled by a Base Transceiver Station (BTS) 18 having a Base Station Controller (BSC) 20.
  • BTS Base Transceiver Station
  • BSC Base Station Controller
  • a mobile When a mobile such as 12 wishes to make a call, it utilises the Random Access Channel (RACH) of the UMTS which is mapped to the Physical Random Access Channel (PRACH).
  • RACH Random Access Channel
  • PRACH Physical Random Access Channel
  • Transmission in this transport channel is based on the well known slotted Aloha approach, that is, a mobile can start a transmission of the PRACH at any one of a number of well defined time offsets, denoted access slots AS and illustrated in Figure 2.
  • the slots are spaced 1.25 milliseconds apart.
  • Several of the slots in Figure 2 are shown as filled by random access transmissions 30. 32, 34. 36.
  • Figure 3 illustrates the structure of a Random Access Transmission such as transmission 30; there are several preamble parts 40a, 40b, 40i, each of length 1 millisecond, and an access burst 42 which contains the preamble part, plus a message part of length 10 milliseconds.
  • Figure 4 shows the structure of the access burst 42. Between a preamble 40j and the message part 44 there is an idle time period of length 0.25 milliseconds. This idle period allows for detection of the preamble part and subsequent online processing of the message part.
  • Figure 5 shows that the RACH message part 44 consists of a data part 46, corresponding to the uplink Dedicated Physical Data Channel (DPDCH) and a Layer 1 control part 48, corresponding to the uplink Dedicated Physical Control Channel (DPCCH).
  • the data and control parts 46, 48 are transmitted in parallel.
  • the data part 46 carries Layer 2/Layer 3 messages requesting radio resources or a user packet.
  • the spreading factor of the data part is limited to SF ⁇ ⁇ 256,128,64,32) corresponding to channel bit rates of 16, 32, 64 and 128 Kbps respectively.
  • the control part 48 carries pilot bits 50 and rate information 52. using a spreading factor of 256.
  • the rate information indicates a spreading factor of the channelisation code which is used on the data part.
  • the mobile 12 reads the Broadcast Control Channel (BCCH) (not illustrated) to get information about i the preamble spreading code(s) ii the available signatures iii the available access slots iv the available spreading factors for the message part v the uplink interference level in the cell vi the primary CCPCH (Common Control Physical Channel) transmit power level
  • BCCH Broadcast Control Channel
  • the MS selects a preamble spreading code and thus the message scrambling code.
  • the MS selects a preamble signature and uses it to determine the primary node of the channelisation codes used by the message part of the access burst.
  • the MS selects a channelisation code (corresponding to a spreading factor) for the message part.
  • the MS estimates the downlink path loss (by using information about the transmitted and received power level of the primary CCPCH). and determines the required uplink transmit power (by using information about the uplink interference level in the cell).
  • the MS implements the dynamic persistence algorithm by: • Reading the current dynamic persistence value from the BCH.
  • step 7 • Deferring transmission for one frame and repeating step 6 if the result of the random draw is negative, otherwise proceeding to step 7.
  • the MS randomly selects an access slot from the available access slots.
  • the MS transmits its preamble at a negative power offset relative to the estimated uplink transmit power. This is illustrated at reference 60 in Figure 7.
  • the MS waits for an acquisition indication (on the AICH) from the network side. If none is received within a predefined time-out period, the MS transmits the preamble again but with a smaller power offset and a re-selected preamble signature, reference 62, showing the higher power.
  • Step 8 is repeated, reference 64, showing a further increase in power, and an acquisition indicator 66 is received from the network side that indicates the acceptance by the network side of the preamble at that power offset.
  • the acquisition indicator 66 is received on the AICH.
  • the random access burst is transmitted in the next available access slot.
  • This burst comprises a repeated preamble 64A and a message 68.
  • the MS 12 sends three preamble signals 80, 82; 84 of increasing strength; when the BTS 18 receives signal 84, it now sends on the AICH an acknowledgement signal 86, variant I, which indicates to the MS 12 that the strength of the preamble 84 is acceptable (i.e. it has passed a Cyclic Redundancy Check (CRC) performed in the BTS 18) but that there is no hardware available to process the message immediately.
  • CRC Cyclic Redundancy Check
  • the MS 12 re-sends the preamble, 84A at the same strength as before.
  • the BTS 18 still does not have resources, and sends the second acknowledgement signal 86A, variant I.
  • the mobile sends the preamble for the third time at the same strength, 84B; the BTS 18 now has resources and sends an acknowledgement signal 88, variant II which indicates that the MS 12 can now send its message; the MS sends preamble 84 again, 84C, and its message 90.
  • Variant II of the acknowledgement signal 88 is identical to the signal 66 and 76 in Figure 7.
  • a second embodiment of the invention is illustrated in Figure 9.
  • the MS 12 sends three preamble signals 80, 82, 84 of increasing strength; when the BTS 18 receives signal 84, at which the signal strength is acceptable, it sends on the AICH an acknowledgement signal 92.
  • the signal 92 is sent when the BTS 18 does not currently have available hardware to process a message immediately, but is able to predict when resources will become available; the signal 92 contains a time out period T, after which hardware will become available.
  • the MS 12 then waits for the period T since last sending its preamble, and resends the preamble at the same strength as before, 82 A, and its message 90, i.e. a random access burst is transmitted in the next available time slot after the time out.
  • acknowledgement signals now contain additional timing information indicating to the MS when to transmit its message burst
  • the difference is that in step 1 1 the procedure now reads:
  • the random access burst is transmitted in the next available access slot as indicated by the timing information now included with this variant of the acknowledgement signal.
  • This burst comprises a repeated preamble 64A and a message 68.”
  • the AICH can be used to send a negative acknowledgement to the MS 12 if reception of the. message 90 fails the CRC performed in the BTS 18.

Abstract

In a UMTS, the AICH is arranged to send, in addition to a signal acknowledging that a preamble (84) from a mobile (12) is at an acceptable strength, an additional signal indicating that the mobile (12) is not currently permitted to send its message (90); this may apply when the BTS (18) does not have hardware resources available. If the BTS (18) can predict when the hardware will become available, the additional signal can include a time out (T) after which the mobile system (12) can send its message signal (90).

Description

IMPROVED MESSAGE ACCESS FOR RADIO TELECOMMUNICATIONS SYSTEM This invention relates to an improved message access arrangement for a radio telecommunications system such as Universal Mobile Telecommunications System (UMTS) and relates especially to message acquisition indications.
To make a connection to the UMTS system, in known arrangements a mobile telephone sends its preamble at a first power, and waits for an acquisition indication on the Acquisition Indication Channel (AICH); if no indication is received, the preamble is resent at increased power, in steps, until an indication is received on the AICH. The message is then sent and if no positive acknowledgement is received via the Forward Access Channel (FACH), the message is assumed to be corrupted and it is resent.
A problem with this arrangement is that the base transceiver station must always have a sufficient level of hardware redundancy to ensure that the message parts of all detected preambles can be processed. This adds a high cost to the base transceiver station, and limits the number of access slots and preamble signatures allowed for each base transceiver station to achieve a given message throughput.
It is the object of the invention to provide a system which has a reduced requirement for hardware redundancy.
According to the invention a radio mobile telecommunications system comprises a base transceiver station arranged to manage a plurality of mobile systems within at least one telecommunications cell; the base station having means to provide an acquisition indication channel by which an acknowledgement signal is sent to indicate that the strength of a preamble signal sent by that mobile system to the base transceiver station has reached a predetermined level; characterised in that said acknowledgement signal is arranged to indicate in addition that the mobile system must not immediately send a message signal.
In the accompanying drawings, the prior art is illustrated in figures 1 - 7 in which :-
Figure 1 is a schematic diagram of a part of a radio telecommunications system;
Figure 2 illustrates a physical random access channel slots structure;
Figure 3 illustrates the structure of a random access transmission; Figure 4 illustrates the structure of an access burst from a mobile;
Figure 5 illustrates the message part of the random access burst;
Figure 6 illustrates the layers involved in message acknowledgement and
Figure 7 illustrates how random access acquisition indication and forward access channels interact to acknowledge preamble and message signals from a mobile.
The invention will be described with reference to Figures 8 and 9 in which: -
Figure 8 indicates RNCH and AICH messages in one embodiment of the invention; and
Figure 9 indicates RACH and AICH messages in a second embodiment of the invention.
In Figure 1 , a part 10 of the UMTS is illustrated, comprising a plurality of mobile systems 10, 12, 14, 16 associated with a telecommunications cell controlled by a Base Transceiver Station (BTS) 18 having a Base Station Controller (BSC) 20.
When a mobile such as 12 wishes to make a call, it utilises the Random Access Channel (RACH) of the UMTS which is mapped to the Physical Random Access Channel (PRACH). Transmission in this transport channel is based on the well known slotted Aloha approach, that is, a mobile can start a transmission of the PRACH at any one of a number of well defined time offsets, denoted access slots AS and illustrated in Figure 2. The slots are spaced 1.25 milliseconds apart. Several of the slots in Figure 2 are shown as filled by random access transmissions 30. 32, 34. 36.
Figure 3 illustrates the structure of a Random Access Transmission such as transmission 30; there are several preamble parts 40a, 40b, 40i, each of length 1 millisecond, and an access burst 42 which contains the preamble part, plus a message part of length 10 milliseconds. Figure 4 shows the structure of the access burst 42. Between a preamble 40j and the message part 44 there is an idle time period of length 0.25 milliseconds. This idle period allows for detection of the preamble part and subsequent online processing of the message part.
Figure 5 shows that the RACH message part 44 consists of a data part 46, corresponding to the uplink Dedicated Physical Data Channel (DPDCH) and a Layer 1 control part 48, corresponding to the uplink Dedicated Physical Control Channel (DPCCH). The data and control parts 46, 48 are transmitted in parallel.
The data part 46 carries Layer 2/Layer 3 messages requesting radio resources or a user packet. The spreading factor of the data part is limited to SFε{256,128,64,32) corresponding to channel bit rates of 16, 32, 64 and 128 Kbps respectively. The control part 48 carries pilot bits 50 and rate information 52. using a spreading factor of 256. The rate information indicates a spreading factor of the channelisation code which is used on the data part.
For RACH transmission, the technique of preamble power ramping is used, and the procedure used by a random request has the following actions :-
1 After cell search and synchronisation, the mobile 12 reads the Broadcast Control Channel (BCCH) (not illustrated) to get information about i the preamble spreading code(s) ii the available signatures iii the available access slots iv the available spreading factors for the message part v the uplink interference level in the cell vi the primary CCPCH (Common Control Physical Channel) transmit power level
The MS selects a preamble spreading code and thus the message scrambling code.
The MS selects a preamble signature and uses it to determine the primary node of the channelisation codes used by the message part of the access burst.
The MS selects a channelisation code (corresponding to a spreading factor) for the message part.
The MS estimates the downlink path loss (by using information about the transmitted and received power level of the primary CCPCH). and determines the required uplink transmit power (by using information about the uplink interference level in the cell).
6. The MS implements the dynamic persistence algorithm by: • Reading the current dynamic persistence value from the BCH.
• Performing a random draw against the current dynamic persistence value.
• Deferring transmission for one frame and repeating step 6 if the result of the random draw is negative, otherwise proceeding to step 7.
7. The MS randomly selects an access slot from the available access slots.
8. The MS transmits its preamble at a negative power offset relative to the estimated uplink transmit power. This is illustrated at reference 60 in Figure 7.
9. The MS waits for an acquisition indication (on the AICH) from the network side. If none is received within a predefined time-out period, the MS transmits the preamble again but with a smaller power offset and a re-selected preamble signature, reference 62, showing the higher power.
10. Step 8 is repeated, reference 64, showing a further increase in power, and an acquisition indicator 66 is received from the network side that indicates the acceptance by the network side of the preamble at that power offset. The acquisition indicator 66 is received on the AICH.
11. If an acquisition indicator is received on the AICH in Step 9, the random access burst is transmitted in the next available access slot. This burst comprises a repeated preamble 64A and a message 68.
12. If the message 68 is corrupted, as indicated by the dotted lines, then there is no positive acknowledgement and actions 1 to 1 1 are repeated, references 70 to
78; message 78 is successfully received, and an acknowledgement 80 is sent from the network on FACH.
Turning now to the first embodiment of the invention illustrated in Figure 8, as before the MS 12 sends three preamble signals 80, 82; 84 of increasing strength; when the BTS 18 receives signal 84, it now sends on the AICH an acknowledgement signal 86, variant I, which indicates to the MS 12 that the strength of the preamble 84 is acceptable (i.e. it has passed a Cyclic Redundancy Check (CRC) performed in the BTS 18) but that there is no hardware available to process the message immediately. In response, the MS 12 re-sends the preamble, 84A at the same strength as before. On receipt, the BTS 18 still does not have resources, and sends the second acknowledgement signal 86A, variant I. The mobile sends the preamble for the third time at the same strength, 84B; the BTS 18 now has resources and sends an acknowledgement signal 88, variant II which indicates that the MS 12 can now send its message; the MS sends preamble 84 again, 84C, and its message 90. Variant II of the acknowledgement signal 88 is identical to the signal 66 and 76 in Figure 7.
A second embodiment of the invention is illustrated in Figure 9. As before, the MS 12 sends three preamble signals 80, 82, 84 of increasing strength; when the BTS 18 receives signal 84, at which the signal strength is acceptable, it sends on the AICH an acknowledgement signal 92. The signal 92 is sent when the BTS 18 does not currently have available hardware to process a message immediately, but is able to predict when resources will become available; the signal 92 contains a time out period T, after which hardware will become available. The MS 12 then waits for the period T since last sending its preamble, and resends the preamble at the same strength as before, 82 A, and its message 90, i.e. a random access burst is transmitted in the next available time slot after the time out.
Unlike the previous variants, these acknowledgement signals now contain additional timing information indicating to the MS when to transmit its message burst, in application of the invention, the difference is that in step 1 1 the procedure now reads:
"If an acquisition indicator is received on the AICH in Step 9. the random access burst is transmitted in the next available access slot as indicated by the timing information now included with this variant of the acknowledgement signal. This burst comprises a repeated preamble 64A and a message 68."
By use of the invention the available hardware resources are used efficiently, with minimum delays to call connection.
In addition, as disclosed in our co-pending application number (?) filed on even date, the AICH can be used to send a negative acknowledgement to the MS 12 if reception of the. message 90 fails the CRC performed in the BTS 18.

Claims

1 A radio mobile telecommunications system comprises a base transceiver station (18) arranged to manage a plurality of mobile systems (12, 14, 16) within at least one telecommunications cell; the base station (18) having means to provide an acquisition indication channel by which an acquisition signal (86) is sent to indicate that the strength of the preamble signals (80, 82, 84) sent by a mobile system (12) to the base transceiver station (18) has reached a predetermined level (84); characterised in that said acknowledgement signal
(86) is arranged to indicate in addition that the mobile 12 must not immediately send a message signal.
2. A system according to Claim 1 in which said acknowledgement signal (86) indicates that the strength of the preamble signal (84) is acceptable but the message signal (90) cannot be accepted at this time.
3 A system according to Claim 1 in which said acknowledgement signal (86) indicates that the strength of the preamble signal (84) is acceptable, and further indicates a predetermined time lag (T) after which the mobile system (12) is permitted to send its message signal (90).
A method of operating a radio mobile telecommunications system comprises :- sending spaced preambles (80, 82, 84) of increasing strength from a mobile (12) to a base transceiver station (18); sending a preamble acknowledgement signal (86) on an acquisition indication channel from the base transceiver station (18) to the mobile (12) when a preamble (84) reaches an acceptable strength; and sending a message signal (90) from the mobile (12) to the base transceiver station (18); characterised in that the preamble acknowledgement signal (86) further indicates that the mobile system (12) is not yet permitted to send its message signal (90).
5. A method according to Claim 4 in which the preamble acknowledgement signal (86) yet further indicates a time delay (T) after which the mobile system (12) is permitted to send its message signal (90).
PCT/GB1999/004180 1999-03-18 1999-12-10 Improved message access for radio telecommunications system WO2000056107A1 (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
AU16711/00A AU1671100A (en) 1999-03-18 1999-12-10 Improved message access for radio telecommunications system
JP2000605433A JP3686338B2 (en) 1999-03-18 1999-12-10 Improved message access for wireless communication systems
EP99959576A EP1159848B1 (en) 1999-03-18 1999-12-10 Improved message access for radio telecommunications system
DE69936401T DE69936401T2 (en) 1999-03-18 1999-12-10 IMPROVED MESSAGE ACCESS TO A RADIO COMMUNICATION SYSTEM
US09/936,101 US7076262B1 (en) 1999-03-18 1999-12-10 Message access for radio telecommunications system

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB9906198.8 1999-03-18
GBGB9906198.8A GB9906198D0 (en) 1999-03-18 1999-03-18 Improved random access channel

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PCT/GB1999/004166 WO2000056106A1 (en) 1999-03-18 1999-12-10 Improved message access for radio telecommunications system
PCT/GB1999/004179 WO2000056096A1 (en) 1999-03-18 1999-12-10 Improved message access for radio telecommunications system

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EP (3) EP1159847B1 (en)
JP (3) JP3799232B2 (en)
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DE (3) DE69936401T2 (en)
GB (1) GB9906198D0 (en)
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EP1159848A1 (en) 2001-12-05

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