1. Title: Power Consumption in Baseband Processors
IEEE MEDIA INDEPENDENT HANDOVER
DCN: xxxx-00-mrpm
Title: Power Consumption in Baseband Processors
Date Submitted: July 12, 2008
Presented at IEEE session #27, in Denver, CO
Authors or Source(s): James Han (Motorola)
Abstract: Power consumptions in baseband processors of multiple radios plays key role in MRPM. Some of the “power saving” states of a single radio may have to be split into sub-states for power consumption investigation. The most important factors are TX/RX times, operation status, and channel availability.
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3. Introduction
MRPM is to manage multi-radios of a mobile device to reduce battery power drains in various use cases such that the multi-radio mobile devices can achieve longer usage times, such as talk/data time and standby time.
From an architecture point of view, a mobile device (multi-radios) consists of an application processor (AP) and multiple baseband processors (BPs). MRPM’s approach is to play with the BPs, such as turning some BP on/off, turning some BP “partially” on/off (that is, so called “power saving modes”).
Proposed model in my contribution in Big Island Interim Meeting, Sept. 2007
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4. Proposed MN Model MN BS1 BP1 BS2 BP2 ApP BSn BPn ● ● ● ● ● ● MIHms PWC
SCC
● ● ●
● ● ●
MIHms
BSn
BPn
MIHn
MIHn
MN: Mobile Node BSi: the ith Base Station or Access Point
ApP: Application Processor BPi: the ith Baseband Processor with ith Radio
MIHi: MIH function for Radioi MIHms: MIH coordinator for MN
PWC: Power Controller SCC: Security Coordinator
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5. Power Consumptions in BPs
In order to understand the actual power consumption, we have to explore the details in operation status of the baseband processors.
Assumptions:
The power control in CDMA and other technologies for synchronization/ adjustment/… of MNs and BS is not in the scope of this investigation;
AP operation can provide BPs needed supports;
We use TDD as an example, similar discussion can be applied to FDD
From power consumption point of view, we can further investigate the following
Transmission (TX) time
Receiving (RX) time
Status of BP: modes, registration, etc.
Channels availability
The following example is the analysis of 3GPP “idle mode”
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6. 3GPP Power Management Enablers
State diagram
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7. Idle Mode in 3GPP Idle mode in 3GPP consists of
Not camped: MN has to scan and camp, then register through a cell. The radio’s TX and RX have to be on continue to support the process until the “camping” completes. No registration. No channel is available. (Power consumption is very high during this period.)
Camped on a GSM/GPRS cell: Registered. MN has to support control signaling for paging, mobility management, and other activities. No bearer channel has established. (Power consumption is relatively low during this period.)
Sub-state: GPRS packet idle mode: Registered. MN has to support control signaling for paging, mobility management, and other activities. The bearer channel has been established. The TX/RX does not carry bearer services. (Power consumption is relatively low during this period.)
Camped on a UTRAN cell: Registered. MN has to support control signaling for paging, mobility management, and other activities. Bearer channel may be established. (Power consumption is relatively low during this period.)
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8. Operation scenarios of 3GPP (for power consumption)
Power-up process
AP and BPs boot up;
All BPs or at least one BP start to “scan and camp” (Power consumption is very high during this period.)
After a successful scan and camp of the radio, say, a 3GPP UE radio, the radio changes to “idle mode”
Operation in out-off-coverage area
Two scenarios: “power-up” and “moving-into” out-of-coverage area;
Power-up: the radio keeps in the “scan and camp” status (see Steps 2 and 3 in Power-up process) until a cell is found and camped;
Moving-into: the radio keeps in the “scan and camp” status until the radio moves into a coverage area and the “scan and camp” process completes (Power consumption is very high during this period.) or other power saving algorithms are applied.
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9. Conclusion The power consumptions of a BP depend on TX and RX times;
Even in the same operation state of a radio, say “idle mode” in 3GPP UE, the power consumption “states” are quite different.
From MRPM point of view, we have to investigate the operation scenarios of existing technologies to develop practical approaches for multi-mode mobile devices
The response times from “power saving” modes to “operation modes” are critical for many real-time applications. Even in the “same” idle mode of 3GPP UE, the service establish time of “GPRS packet idle mode” is much lower than “Camped on a GSM/GPRS cell mode”. However, the drawback of “GPRS packet idle mode” is the channel resource has been occupied.
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10. Q&A
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