WO2006048631A1 - A method of controlling transmission rate in a mobile terminal in soft handover - Google Patents

A method of controlling transmission rate in a mobile terminal in soft handover Download PDF

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Publication number
WO2006048631A1
WO2006048631A1 PCT/GB2005/004218 GB2005004218W WO2006048631A1 WO 2006048631 A1 WO2006048631 A1 WO 2006048631A1 GB 2005004218 W GB2005004218 W GB 2005004218W WO 2006048631 A1 WO2006048631 A1 WO 2006048631A1
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WO
WIPO (PCT)
Prior art keywords
mobile terminal
data
transmission rate
overload
priority
Prior art date
Application number
PCT/GB2005/004218
Other languages
French (fr)
Inventor
Anthony Peter Hulbert
Phillip Booker
Thomas Malcolm Chapman
Jörn KRAUSE
Original Assignee
Siemens Aktiengesellschaft
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
Priority claimed from GB0424398A external-priority patent/GB0424398D0/en
Priority claimed from GB0424527A external-priority patent/GB2420054A/en
Application filed by Siemens Aktiengesellschaft filed Critical Siemens Aktiengesellschaft
Publication of WO2006048631A1 publication Critical patent/WO2006048631A1/en

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/50—Allocation or scheduling criteria for wireless resources
    • H04W72/54—Allocation or scheduling criteria for wireless resources based on quality criteria
    • H04W72/542—Allocation or scheduling criteria for wireless resources based on quality criteria using measured or perceived quality
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L47/00—Traffic control in data switching networks
    • H04L47/10—Flow control; Congestion control
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J3/00—Time-division multiplex systems
    • H04J3/02—Details
    • H04J3/10—Arrangements for reducing cross-talk between channels
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00—Data switching networks
    • H04L12/54—Store-and-forward switching systems 
    • H04L12/56—Packet switching systems
    • 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
    • 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
    • H04W52/40—TPC being performed in particular situations during macro-diversity or soft handoff
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/20—Control channels or signalling for resource management
    • H04W72/23—Control channels or signalling for resource management in the downlink direction of a wireless link, i.e. towards a terminal

Definitions

  • Enhanced Uplink is a new package of features introduced into the 3 rd generation partnership project (3 GPP) Release 6 that aims to improve radio resource management in the uplink and hence to improve uplink throughput and reduce delay.
  • 3 GPP 3 rd generation partnership project
  • Enhanced Uplink is node B scheduling.
  • the node B is given autonomy to restrict, using layer 1 signalling, the data rate at which enhanced uplink dedicated channel (E-DCH) enabled terminals may transmit in order to manage at least a portion of wideband code division multiple access (WCDMA) interference.
  • E-DCH enhanced uplink dedicated channel
  • WCDMA wideband code division multiple access
  • Some terminals will be in inter node B soft handover, which means that the uplink transmission is received by a number of node Bs. As soon as one of the node Bs indicates that it has correctly received a data block, the terminal may start to transmit a new block, even though the remaining node Bs never received the block correctly. In such a soft handover (SHO) situation, at least one node B may be designated as a primary node B responsible for scheduling, and this node B needs to receive the scheduling information.
  • SHO soft handover
  • overload indicators may be common to all UEs in SHO with a node B, or dedicated.
  • overload indicator mechanism may affect the ability of the network to provide the required quality of service (QoS).
  • a method of controlling transmission rate in a mobile terminal in soft handover comprises receiving one or more overload indicators at the mobile terminal; determining a priority level of data being transmitted by the mobile terminal; and adapting the transmission rate at the mobile terminal in accordance with the received overload indicator and the priority of the data being transmitted.
  • Node B scheduling of UE data rates is new to the Enhanced Uplink feature and hence this feature has not arise before now in the 3GPP standards.
  • the present invention enables the terminal behaviour to change in response to an overload indicator, dependent upon the priority of the data being transmitted at the time. This is achieved by making adjustments at the terminal side, rather than on the network side, as has been done conventionally. This provides the advantage that the terminal receives overload indicators form multiple base stations and adapts its data rate according to the priority of data at the terminal, rather than simply being told by the network what data rate to use.
  • high and low priority overload indicators are received; the indicator related to the determined priority level of the data being transmitted is applied; and the transmission rate adapted accordingly.
  • a single indicator is received; and the mobile terminal adapts its transmission rate by an amount related to the determined priority level of the data.
  • an overload indicator bit level is set in the terminal, whereby the transmission rate is only adapted if the number of received overload indicators exceeds the set level.
  • the predetermined level is related to the priority level of the data being transmitted by the mobile terminal.
  • the transmission rate does not change, but preferably, the transmission rate is reduced.
  • Figure 1 illustrates a first arrangement in which the method of the present invention is carried out
  • Figure 2 illustrates a second arrangement in which the method of the present invention is carried out
  • Figure 3 illustrates signalling for the example of Fig. 1;
  • Figure 4 illustrates further signalling for the example of Fig.1;
  • Figure 5 shows the conventional effect of applying the control shown in Fig. 4;
  • Figure 6 illustrates control applied in a first example for the arrangement of Fig. l;
  • Figure 7 illustrates control applied for the arrangement of Fig. 2; and,
  • Figure 8 illustrates control applied in a second example of the arrangement of Fig. 1.
  • the present invention modifies the UE behaviour such that each logical flow in the UE is linked to a priority setting that determines how many consecutive overload (OL) bits, or OL bits from multiple node Bs, the UE must receive before it is required to reduce its rate. This number could be set lower for low priority classes compared to higher priority classes.
  • each logical flow in the UE is linked to a priority setting that determines the amount by which the UE must reduce its data rate, or its transmit power. Lower priority data is required to be reduced by a larger factor than higher priority data.
  • each logical flow in the UE is linked to a different
  • overload indicator sent by the network dependent upon its priority.
  • the network has to send overload bits relating to each priority class.
  • the UE behaviour is such that the response to overload bits is dependent on the priority of the data.
  • a number of terminals Tl, T3 and T6 are scheduled by a first node B, NBl .
  • the other terminals T2, T4, T5 and T7 are scheduled by NB2. Since all the terminals in soft handover may be communicating via NBl or NB2, problems can arise if there is a conflict in the instructions from one or other node B.
  • Two of the UEs, T5 and T7 are in soft handover between the two node Bs, NBl and NB2. Both of these UEs are scheduled by NB2.
  • T7 has high priority data
  • T5 has lower priority data.
  • NBl sets a common overload bit. As shown by Fig. 3, NB2 increases the data rate for T5 and T7, but Fig. 4 shows that this causes an overload at NBl which sends a down signal to all the terminals Tl, T3, T5, T6 and T7, within its area Al, including both T5 and T7, without affecting the terminals in the remainder of area A2.
  • the overload bit is received by T5 and T7.
  • the effect of this overload down indication is for all the terminals to reduce their data rate by the same amount, as shown in Fig. 5 for T5 and T7.
  • the priority setting for T5 is such that T5 must respond when it receives 1 overload bit, whereas T7 only needs to respond when it receives 2 overload bits.
  • Fig. 6a illustrates the effect where T7 has high priority and T5 has low priority.
  • Figs. 2 and 7 illustrate a second example, where there are 3 node Bs, NBl, NB2 and NB3 covering areas Al, A2 and A3 respectively and the effect of an overload indicator from 2 out of the 3 base stations is to put both the low and high priority terminals down.
  • the two UEs, T5 and T7 are in soft handover between the three node Bs, NBl and NB2 and NB3. Both of the UEs are scheduled by NB2.
  • T7 has high priority data
  • T5 has lower priority data.
  • the overload bits are received by T5 and T7.
  • the priority setting for T5 is such that T5 must respond when it receives 1 overload bit, whereas the other UE must only respond when it receives 2 overload bits. Therefore, T5 reduces its data rate and T7 counts two overload bits, one from NB2 and one from NB3 and also reduces its data rate.
  • Fig. 8 illustrates another situation with two node Bs.
  • the overload indicator causes each terminal to go down by a factor Pl for the low priority terminal and P2 for the high priority terminal.
  • the two UEs, T5 and T7 are in soft handover between two node Bs, NB 1 and NB2. Both of the UEs are scheduled by NBl .
  • T7 has high priority data
  • T5 has lower priority data.
  • T5 reduces its transmit power (and data rate) by a factor Pl and T7 reduces its transmit power (and data rate) by a factor P2 where P1>P2 to reflect the terminals relative priorities.

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

Abstract

A method of controlling transmission rate in a mobile terminal (T5, T) in soft handover, comprises receiving one or more overload indicators at the mobile terminal; determining a priority level (P1, P2) of data being transmitted by the mobile terminal; and adapting the transmission rate at the mobile terminal in accordance with the received overload indicator and the priority of the data being transmitted.

Description

A METHOD OF CONTROLLING TRANSMISSION RATE IN A MOBILE TERMINAL IN SOFT HANDOVER
Enhanced Uplink is a new package of features introduced into the 3rd generation partnership project (3 GPP) Release 6 that aims to improve radio resource management in the uplink and hence to improve uplink throughput and reduce delay.
One of the key features introduced in Enhanced Uplink is node B scheduling. In this feature, the node B is given autonomy to restrict, using layer 1 signalling, the data rate at which enhanced uplink dedicated channel (E-DCH) enabled terminals may transmit in order to manage at least a portion of wideband code division multiple access (WCDMA) interference. To facilitate node B scheduling, information is required to be sent by the user equipment (UE) to the node B. This information may be sent using separate physical layer signalling, or as a header included with E-DCH data packets.
Some terminals will be in inter node B soft handover, which means that the uplink transmission is received by a number of node Bs. As soon as one of the node Bs indicates that it has correctly received a data block, the terminal may start to transmit a new block, even though the remaining node Bs never received the block correctly. In such a soft handover (SHO) situation, at least one node B may be designated as a primary node B responsible for scheduling, and this node B needs to receive the scheduling information.
It is likely that only one node B will be responsible for scheduling a UE in soft handover, even though the UE will cause interference and processing requirements in neighbouring cells. To avoid potentially damaging overload situations, it is envisaged that the neighbouring cells will be given the ability to send "overload" indicators to the UE, which indicate that the UE must reduce its transmit rate. The overload indicators may be common to all UEs in SHO with a node B, or dedicated.
The problem is that the node Bs that set overload indicators do not necessarily know whether the UE needs to transmit high priority data. Also, common overload indicators will apply to all UEs, regardless of whether they have high or low priority data. Hence the overload indicator mechanism may affect the ability of the network to provide the required quality of service (QoS).
In accordance with the present invention, a method of controlling transmission rate in a mobile terminal in soft handover comprises receiving one or more overload indicators at the mobile terminal; determining a priority level of data being transmitted by the mobile terminal; and adapting the transmission rate at the mobile terminal in accordance with the received overload indicator and the priority of the data being transmitted. Node B scheduling of UE data rates is new to the Enhanced Uplink feature and hence this feature has not arise before now in the 3GPP standards. The present invention enables the terminal behaviour to change in response to an overload indicator, dependent upon the priority of the data being transmitted at the time. This is achieved by making adjustments at the terminal side, rather than on the network side, as has been done conventionally. This provides the advantage that the terminal receives overload indicators form multiple base stations and adapts its data rate according to the priority of data at the terminal, rather than simply being told by the network what data rate to use.
In one embodiment, high and low priority overload indicators are received; the indicator related to the determined priority level of the data being transmitted is applied; and the transmission rate adapted accordingly.
Alternatively, a single indicator is received; and the mobile terminal adapts its transmission rate by an amount related to the determined priority level of the data.
In another embodiment, an overload indicator bit level is set in the terminal, whereby the transmission rate is only adapted if the number of received overload indicators exceeds the set level.
Preferably, the predetermined level is related to the priority level of the data being transmitted by the mobile terminal.
In some cases, the transmission rate does not change, but preferably, the transmission rate is reduced.
An example of a method of controlling transmission rate in a mobile terminal in soft handover will now be described with reference to the accompanying drawings in which:
Figure 1 illustrates a first arrangement in which the method of the present invention is carried out;
Figure 2 illustrates a second arrangement in which the method of the present invention is carried out;
Figure 3 illustrates signalling for the example of Fig. 1; Figure 4 illustrates further signalling for the example of Fig.1; Figure 5 shows the conventional effect of applying the control shown in Fig. 4; Figure 6 illustrates control applied in a first example for the arrangement of Fig. l; Figure 7 illustrates control applied for the arrangement of Fig. 2; and,
Figure 8 illustrates control applied in a second example of the arrangement of Fig. 1.
The present invention modifies the UE behaviour such that each logical flow in the UE is linked to a priority setting that determines how many consecutive overload (OL) bits, or OL bits from multiple node Bs, the UE must receive before it is required to reduce its rate. This number could be set lower for low priority classes compared to higher priority classes. Alternatively, each logical flow in the UE is linked to a priority setting that determines the amount by which the UE must reduce its data rate, or its transmit power. Lower priority data is required to be reduced by a larger factor than higher priority data. Thus, not only are instructions from neighbouring base stations taken into account when determining transmission rate, but also the priority setting of a particular logical flow. This allows the terminal to influence the outcome, rather than simply accept instructions from the network. In another embodiment, each logical flow in the UE is linked to a different
"overload indicator" sent by the network dependent upon its priority. In this solution, the network has to send overload bits relating to each priority class. The UE behaviour is such that the response to overload bits is dependent on the priority of the data.
Referring now to a first example based on the arrangement shown in Fig.l, a number of terminals Tl, T3 and T6 are scheduled by a first node B, NBl . The other terminals T2, T4, T5 and T7 are scheduled by NB2. Since all the terminals in soft handover may be communicating via NBl or NB2, problems can arise if there is a conflict in the instructions from one or other node B. Two of the UEs, T5 and T7 are in soft handover between the two node Bs, NBl and NB2. Both of these UEs are scheduled by NB2. T7 has high priority data, whereas T5 has lower priority data. If the interference at NBl rises above an acceptable threshold, then NBl sets a common overload bit. As shown by Fig. 3, NB2 increases the data rate for T5 and T7, but Fig. 4 shows that this causes an overload at NBl which sends a down signal to all the terminals Tl, T3, T5, T6 and T7, within its area Al, including both T5 and T7, without affecting the terminals in the remainder of area A2.
The overload bit is received by T5 and T7. Conventionally, the effect of this overload down indication is for all the terminals to reduce their data rate by the same amount, as shown in Fig. 5 for T5 and T7. However, the priority setting for T5 is such that T5 must respond when it receives 1 overload bit, whereas T7 only needs to respond when it receives 2 overload bits. Fig. 6a illustrates the effect where T7 has high priority and T5 has low priority. When the down signal is sent, T5 reduces its data rate and T7 keeps transmitting at the same data rate. However the interference at NB2 is still too high, so the overload bit is set again. When NBl sends another overload indicator, then the combined effect, shown in Fig. 6b is to exceed the limit, even for the high priority data, so T5 again reduces its data rate, and this time T7 reduces its data rate
Figs. 2 and 7 illustrate a second example, where there are 3 node Bs, NBl, NB2 and NB3 covering areas Al, A2 and A3 respectively and the effect of an overload indicator from 2 out of the 3 base stations is to put both the low and high priority terminals down. The two UEs, T5 and T7 are in soft handover between the three node Bs, NBl and NB2 and NB3. Both of the UEs are scheduled by NB2. T7 has high priority data, whereas T5 has lower priority data. When the interference at NB2 and at NB3 rises above an acceptable threshold and NB2 sets a common overload bit, the overload bits are received by T5 and T7. The priority setting for T5 is such that T5 must respond when it receives 1 overload bit, whereas the other UE must only respond when it receives 2 overload bits. Therefore, T5 reduces its data rate and T7 counts two overload bits, one from NB2 and one from NB3 and also reduces its data rate. Based on the arrangement of Fig. 1, Fig. 8 illustrates another situation with two node Bs. Here the overload indicator causes each terminal to go down by a factor Pl for the low priority terminal and P2 for the high priority terminal. The two UEs, T5 and T7 are in soft handover between two node Bs, NB 1 and NB2. Both of the UEs are scheduled by NBl . T7 has high priority data, whereas T5 has lower priority data. If the interference at NB2 rises above an acceptable threshold, NB2 sets a common overload bit and the overload bit is received by T5 and T7. T5 reduces its transmit power (and data rate) by a factor Pl and T7 reduces its transmit power (and data rate) by a factor P2 where P1>P2 to reflect the terminals relative priorities.

Claims

1. A method of controlling transmission rate in a mobile terminal in soft handover, the method comprising receiving one or more overload indicators at the mobile terminal; determining a priority level of data being transmitted by the mobile terminal; and adapting the transmission rate at the mobile terminal in accordance with the received overload indicator and the priority of the data being transmitted.
2. A method according to claim 1 , wherein high and low priority overload indicators are received; the indicator related to the determined priority level of the data being transmitted is applied; and the transmission rate adapted accordingly.
3. A method according to claim 1 , wherein a single indicator is received; and the mobile terminal adapts its transmission rate by an amount related to the determined priority level of the data.
4. A method according to claim 1 , wherein an overload indicator bit level is set in the terminal, whereby the transmission rate is only adapted if the number of received overload indicators exceeds the set level.
5. A method according to claim 4, wherein the predetermined level is related to the priority level of the data being transmitted by the mobile terminal.
6. A method according to any preceding claim, wherein the transmission rate is reduced.
PCT/GB2005/004218 2004-11-04 2005-11-02 A method of controlling transmission rate in a mobile terminal in soft handover WO2006048631A1 (en)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
GB0424398.6 2004-11-04
GB0424398A GB0424398D0 (en) 2004-11-04 2004-11-04 Terminal response to overload
GB0424527A GB2420054A (en) 2004-11-05 2004-11-05 A method of controlling transmission rate in a mobile terminal in soft handover
GB0424527.0 2004-11-05

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WO2006048631A1 true WO2006048631A1 (en) 2006-05-11

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WO2010000092A1 (en) * 2008-07-01 2010-01-07 朗讯科技公司 The terminal handover control method and apparatus in wireless communication network
EP2408229A1 (en) * 2009-03-10 2012-01-18 ZTE Corporation Method and device for generating and reporting overload indicator report

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US20020193118A1 (en) * 2001-06-07 2002-12-19 Avinash Jain Method and apparatus for congestion control in a wireless communication system
US20030133409A1 (en) * 1999-09-30 2003-07-17 Corazza Giovanni E. Closed loop resource allocation

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US20030133409A1 (en) * 1999-09-30 2003-07-17 Corazza Giovanni E. Closed loop resource allocation
WO2001086992A1 (en) * 2000-05-08 2001-11-15 Motorola Inc. Improving the performance of a cdma system
US20020193118A1 (en) * 2001-06-07 2002-12-19 Avinash Jain Method and apparatus for congestion control in a wireless communication system

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2010000092A1 (en) * 2008-07-01 2010-01-07 朗讯科技公司 The terminal handover control method and apparatus in wireless communication network
EP2408229A1 (en) * 2009-03-10 2012-01-18 ZTE Corporation Method and device for generating and reporting overload indicator report
EP2408229A4 (en) * 2009-03-10 2014-03-12 Zte Corp Method and device for generating and reporting overload indicator report

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Publication number Publication date
GB0522360D0 (en) 2005-12-07
GB2420254B (en) 2007-03-07
GB2420254A (en) 2006-05-17

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