GB2498044A - A communications apparatus comprising two processors, only one of which is required to process paging messages. - Google Patents

A communications apparatus comprising two processors, only one of which is required to process paging messages. Download PDF

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Publication number
GB2498044A
GB2498044A GB1220425.1A GB201220425A GB2498044A GB 2498044 A GB2498044 A GB 2498044A GB 201220425 A GB201220425 A GB 201220425A GB 2498044 A GB2498044 A GB 2498044A
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GB
United Kingdom
Prior art keywords
communications
processor
layer
communications apparatus
handset
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.)
Granted
Application number
GB1220425.1A
Other versions
GB201220425D0 (en
GB2498044B (en
Inventor
Ian K Appleton
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.)
Qualcomm Technologies International Ltd
Original Assignee
Cambridge Silicon Radio Ltd
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 Cambridge Silicon Radio Ltd filed Critical Cambridge Silicon Radio Ltd
Publication of GB201220425D0 publication Critical patent/GB201220425D0/en
Publication of GB2498044A publication Critical patent/GB2498044A/en
Application granted granted Critical
Publication of GB2498044B publication Critical patent/GB2498044B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F1/00—Details not covered by groups G06F3/00 - G06F13/00 and G06F21/00
    • G06F1/26—Power supply means, e.g. regulation thereof
    • G06F1/32—Means for saving power
    • G06F1/3203—Power management, i.e. event-based initiation of a power-saving mode
    • G06F1/3234—Power saving characterised by the action undertaken
    • G06F1/325—Power saving in peripheral device
    • G06F1/3278—Power saving in modem or I/O interface
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F1/00—Details not covered by groups G06F3/00 - G06F13/00 and G06F21/00
    • G06F1/26—Power supply means, e.g. regulation thereof
    • G06F1/32—Means for saving power
    • G06F1/3203—Power management, i.e. event-based initiation of a power-saving mode
    • G06F1/3234—Power saving characterised by the action undertaken
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F1/00—Details not covered by groups G06F3/00 - G06F13/00 and G06F21/00
    • G06F1/26—Power supply means, e.g. regulation thereof
    • G06F1/32—Means for saving power
    • G06F1/3203—Power management, i.e. event-based initiation of a power-saving mode
    • G06F1/3234—Power saving characterised by the action undertaken
    • G06F1/3293—Power saving characterised by the action undertaken by switching to a less power-consuming processor, e.g. sub-CPU
    • 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
    • H04W52/02—Power saving arrangements
    • H04W52/0209—Power saving arrangements in terminal devices
    • 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
    • H04W52/02—Power saving arrangements
    • H04W52/0209—Power saving arrangements in terminal devices
    • H04W52/0261—Power saving arrangements in terminal devices managing power supply demand, e.g. depending on battery level
    • H04W52/0274—Power saving arrangements in terminal devices managing power supply demand, e.g. depending on battery level by switching on or off the equipment or parts thereof
    • H04W52/028—Power saving arrangements in terminal devices managing power supply demand, e.g. depending on battery level by switching on or off the equipment or parts thereof switching on or off only a part of the equipment circuit blocks
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
    • Y02D10/00—Energy efficient computing, e.g. low power processors, power management or thermal management
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
    • Y02D30/00—Reducing energy consumption in communication networks
    • Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks

Abstract

A communications apparatus which operates using a standard 3GPP multi-layer protocol stack (or possibly another protocol stack), the communications apparatus comprising an application processor 12 and a communications processor 16, wherein the communications processor 16 is configured to handle all functionality related to paging of the communications apparatus without intervention from the application processor. The communications processor 16 may be configured to implement the functionality related to the lower layers of the 3GPP protocol stack (i.e. layers 1-3, a single layer or the physical layer) and the application processor configured to implement functionality related to the upper layers of the 3GPP protocol stack. As the application processor 12 does not need to wake up upon paging, battery life is increased.

Description

A Communications Apparatus The present invention relates to a communications apparatus.
It is common for communications apparatus such as mobilc tclcphone handsets to cmploy two scparate processors, an application processor which handles applications which may be run on the handset and a dedicated communications processor for handling physical communications functions of thc handsct, such as transmitting and receiving signals containing data.
Many communications systems use a multi-layer protocol stack to manage the transfer and processing of data. For example, the 3GPP standard uses a multi-layer stack, in which layer I (the lowermost laycr) is responsible for hardware control, including transmitting and receiving data. Layers 2 and 3 are responsible for configuring data to bc transmitted, for example by constructing frames for data transmission which may include headers, checksum bits and the like in addition to the data to be transmitted. Above layer 3 there are applications which deal with titnetions related to a uscr intcrface of the handset and the like.
Typically, thc communications proccssor of a mobile telephonc handset handles the laycr 1-3 functionality, whilst the application proccssor handles thc application functionality. To minimisc power consumption in an idle mode of the handset it is desirable for thc application proccssor to enter a stand-by modc when no application functionality is required. A difficulty with this approach, however, is that paging messages which are periodically received by the communications processor must be passed to the application processor to decode. This requires thc application processor to cxit the stand-by modc, which increases thc powcr consumption of the handsct.
According to a first aspect of thc prcscnt invention, therc is provided a communications apparatus which operates using a multi-layer protocol stack, the communications apparatus comprising an application processor and a communications processor, wherein the communications processor is configured to handle all functionality related to paging of thc communications apparatus without intervention from the application processor.
By confining handling of paging of the communications apparatus to the communications processor in this way, paging messages do not need to be passed from the communications processor to the application processor. This can bring about power savings in the communications apparatus, as the application processor can be deactivated or left in a stand-by mode in which less power is consumed when not in use, and need not be activated to handle paging messages.
The communications processor may be configured to implement functionality related to lower layers of the multi-layer stack and the application processor may be configured to implement functionality related to upper layers of the multi-layer protocol stack.
The communications processor may be configured to implement functionality related to layers Ito 3 of the multi-layer stack.
The communications processor may be configured such that all functionality related to paging of the communications apparatus is implemented in a single layer of the multi-layer protocol stack.
The layer may be a physical layer of the multi-layer protocol stack.
A software module may be associated with the layer of the protocol stack, which software module is configured to handle at least part of the paging of the communications apparatus.
Embodiments of the invention will now be described, strictly by way of example only, with reference to the accompanying drawings, of which Figure 1 is a schematic representation of a communications apparatus, such as a mobile telephone handset; and Figure 2 is a schematic representation of a protocol stack used by the communications apparatus of Figure 1 Figure 1 is a schematic representation of a communications apparatus, in this example a mobile telephone handset, which is shown generally at 10. The handset 10 comprises an application processor 12, which, in this example, is provided as a single integrated circuit (IC), although it may be provided in a combined package with a communications processor 16. and handles the operation of applications, such as an operating system, which run on the handset 10. The application processor 12 has an associated memory 14, which may be provided as one or more separate lCs, but is preferably provided as an integral part of the application processor IC.
A dedicated communications processor 16 is provided, in this example as a separate IC, although it may be provided in a combined package with the application processor 12, and is responsible for handling functions of the handset 10 related to transmitting and receiving data through a propagation channel. The communications processor 16 is connected to one or more antennae 18 of the handset 10 to transmit and receive appropriate signals.
In this example, the handset 10 is compliant with the 3GPP standard, and operates using a multi-layer protocol stack, as is illustrated generally at 20 in Figure 2. However, it will be appreciated that other types of protocol stacks may be employed for managing data transfer between different functional elements of the handset 10. The multi-layer protocol stack will be familiar to those skilled in the art, and thus only those parts which are relevant to the present invention will be described in detail here.
The lowermost layer 22 (layer 1) of the protocol stack is known as the physical layer, and this layer deals with interactions with the physical medium (i.e. the air interface) over which data is transmitted and received by the handset 10. Thus, functions such as modulation, demodulation, coding, error correction and transmission of signals are performed in this layer. These functions are carried out by the communications processor 1 6, which, in the exemplary case of a transmission, receives data which has been processed in the higher layers of the protocol stack by the application processor 12 and applies appropriate coding and modulation before transmitting a signal comprising the coded and modulated data. When a signal is received, the communications processor 16 demodulates and decodes the received signal and passes the raw data carried by the signal up the protocol stack 20 to the application processor 12 for further processing.
Layer 3, which is illustrated at 24 in Figure 2, is known as the network layer or the signalling layer, and deals with the connection and switching of communications links. The functionality of this layer is implemented in the communications processor 16 of the handset 10.
An advantage of the arrangement shown in Figure 1, in which there is a dedicated communications processor 16 which is separate from the application processor 12 is that when the application processor 12 is not required, it can be switched off, or put into a stand-by mode, so as to reduce power consumption. However, a difficuhy arises in handsets using this arrangement, in that the application processor 12 must be "woken up" every time a paging message is received from a network serving the handset 10, as the communications processor 16 is not able to handle such messages on its own.
The network serving the handset 10 periodicaUy broadcasts paging messages to handsets on that network to inform the handsets of incoming calls, text messages and the like. These paging messages contain, amongst other data, an identifier, which must be checked by the handset 10 against its own identifier, to assess whether the paging message was intended for the handset 10, or for another device being served by the network.
When a paging message is received by the handset 10, the communications processor 16 demodulates and decodes the received signal, before passing the data contained in the received signal, including the identifier, up the protocol stack 20 to the application layer, which is implemented by the application processor 12. The application processor 12 compares the identifier with an identifier of the handset 10, and if the two identifiers match, a signal is transmitted to the network in response to the paging message. A disadvantage of this approach, as explained above, is that the application processor 12 must exit its stand-by mode every time a paging message is received. As paging messages arc broadcast regularly by the network, the application processor 12 must exit its stand-by mode regularly, which limits the amount of power saved.
In a communications apparatus such as a handset 10 according to the present invention, the communications processor 16 is configured to handle all frnetionality associated with paging of the handset 10 without intervention from the application processor 12. Thus, on receiving a paging message from a network serving the handset 10, the communications processor 16 demodulates and decodes the received signal. The identifier is extracted from the data contained in the received signal by the communications processor 16 and verified by the communications processor 16, by comparing it to the identifier of the handset 10, which may be stored in the memory 14, or otherwise known to the communications processor 16.
If the identifier contained in the received signal corresponds to the identifier of the handset 10, the message is intended for the handset 10, and thus the communications processor causes the application processor 12 to be activated, so that it can handle the incoming call, text message or the like. If the identifier contained in the received signal does not correspond to that of the handset 10, the application processor 12 is allowed to remain in its stand-by mode.
By confining the handling of paging messages to the communications processor 16 in this way, the application processor 12 need not be activated as frequently as in prior art systems, which gives rise to power savings over such systems. However, when it is determined that a paging message is intended for the handset 10, the application processor 12 can be activated in good time to handle the incoming call, text message or the like. Thus, there is no reduction in the functionality of the handset 10.
In a particular embodiment of the invention, the functions of the handset 10 which relate to paging, for example the verification of the identifier transmitted by the network in the paging message, are transferred to the physical layer 22 (layer I) of the protocol stack. As the functionality of this layer is implemented by the communications processor 16, paging messages can be handled without causing the application processor 12 to exit its stand-by mode. It will be appreciated, however, that only fhnctions related to the handling of paging messages need be transferred to the physical layer 22 (layer 1), and indeed if additional functions were moved to the physical layer 22, the communications processor 16 could become unnecessarily complex.
The functions which relate to paging of the handset 10 may be built into the physical layer 22 of the protocol stack 20, or there may be a separate software module associated with the physical layer 22, which software module can be accessed and controlled by the physical layer 22 to implement the functions relating to paging of the handset 10. Using a separate software module which is associated with the physical layer 22 rather than implementing the functions relating to paging of the handset 10 directly in the physical layer 22 avoids over-complicating the physical layer 22.
The embodiments described above use separate application and communications processors, but the invention may be equally applicable to systems having different architectures, such as a system in which all of the functionality ofthe application and communications processors is implemented in a single IC. In this examp'e. a handset 10 may comprise a single application/communications processor having a plurality of functional units which can each be switched off or put into a stand-by when not in use, so as to reduce power consumption.
By implementing functions relating to paging in a functional unit which handles the physical layer 22 of such a processor, other functional units, such as those which handle the network layer 24, need not be switched on or exit their stand-by mode every time a paging message is received, thus reducing the power consumption of the handset 10.
Similarly, in a system comprising a single processor which accesses extemal memory, by implementing functions relating to paging of the handset in the physical layer 22 of the processor, it may be possible to reduce the amount of external memory access that must be performed. For example, the system may include memory elements associated with the physical layer 22 and the application layer, and by implementing the functions related to paging of the handset in the physical layer 22, it is not necessary for the memory element associated with the application layer to be accessed in response to a paging message. Thus, this memory element may remain switched otT or in stand-by mode, reducing the power consumption of the handset 10.

Claims (1)

  1. <claim-text>Claims 1. A communications apparatus which operates using a multi-layer protocol stack, the communications apparatus comprising an application processor and a communications processor, wherein the communications processor is configured to handle all functionality related to paging of the communications apparatus without intervention from the application processor.</claim-text> <claim-text>2. A communications apparatus according to claim I wherein the communications processor is configured to implement functionality related to lower layers of thc multi-layer stack and the application processor is configured to implement functionality related to upper layers of the multi-layer protocol stack.</claim-text> <claim-text>3. A communications apparatus according to claim 2 wherein the communications processor is configured to implement functionality related to layers 1 to 3 of the multi-layer stack.</claim-text> <claim-text>4. A communications apparatus according to claim I wherein the communications processor is configured such that all functionality related to paging of the communications apparatus is implemented in a single layer of the multi-layer protocol stack.</claim-text> <claim-text>5. A communications apparatus according to claim 4 wherein thc laycr is a physical layer of the multi-layer protocol stack.</claim-text> <claim-text>6. A communications apparatus according to claim 4 wherein a software module is associated with the layer of the protocol stack, which software module is configured to handle at least part of the paging of the communications apparatus.</claim-text>
GB1220425.1A 2011-11-18 2012-11-13 A communications apparatus comprising two processors, only one of which is required to process paging messages. Active GB2498044B (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US13/300,200 US20130130747A1 (en) 2011-11-18 2011-11-18 Communications Apparatus

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GB2498044A true GB2498044A (en) 2013-07-03
GB2498044B GB2498044B (en) 2014-06-04

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Publication number Priority date Publication date Assignee Title
US9760150B2 (en) * 2012-11-27 2017-09-12 Nvidia Corporation Low-power states for a computer system with integrated baseband

Citations (3)

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US20030135771A1 (en) * 2001-03-16 2003-07-17 Cupps Bryan T. Novel personal electronics device with a dual core processor
US20030163666A1 (en) * 2001-03-16 2003-08-28 Cupps Bryan T. Novel personal electronics device with display switching
US20110026694A1 (en) * 2000-10-13 2011-02-03 Access Systems Americas, Inc. Method and apparatus for integrating phone and pda user interfaces on a single processor

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CN101453785B (en) * 2002-03-29 2012-08-22 美商内数位科技公司 Low layer paging indicator processing system and method for multi-layer communication equipment used in a wireless communication system
WO2007148932A1 (en) * 2006-06-21 2007-12-27 Electronics And Telecommunications Research Institute Method for paging terminal of rrc connected state in lte system
US8938568B2 (en) * 2010-08-19 2015-01-20 Ineda Systems Pvt. Ltd Multi-processor electronic systems
US8595529B2 (en) * 2010-12-16 2013-11-26 Qualcomm Incorporated Efficient power management and optimized event notification in multi-processor computing devices

Patent Citations (3)

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Publication number Priority date Publication date Assignee Title
US20110026694A1 (en) * 2000-10-13 2011-02-03 Access Systems Americas, Inc. Method and apparatus for integrating phone and pda user interfaces on a single processor
US20030135771A1 (en) * 2001-03-16 2003-07-17 Cupps Bryan T. Novel personal electronics device with a dual core processor
US20030163666A1 (en) * 2001-03-16 2003-08-28 Cupps Bryan T. Novel personal electronics device with display switching

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US20130130747A1 (en) 2013-05-23
GB201220425D0 (en) 2012-12-26
GB2498044B (en) 2014-06-04

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